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@gjarrett ,
No one wants more work or to manage multiple logins. The good news is that you can easily do multiple drafts with the Turnitin LTI. All it takes is setting up one assignment per draft in Canvas: Rough Draft assignment and then final draft assignment. I do this in all of my classes (also higher ed), and it works well for me.
I have some video tutorials on how to do this and other things with the Turnitin LTI at my blog post https://community.canvaslms.com/groups/plagiarism/blog/2015/04/18/canvas-and-turnitin?sr=search&sear.... Perhaps checking out the tutorials will give you some ideas on how to best leverage the Turnitin LTI and make your life easier. 
@dhulsey
Here is our LTI Configuration, I took out the consumer key for the screen shot. Students have all been random with different assignments. We now say:
1. Try a different Browser
2. Restart your computer
3. Try a different computer
4. Try a different file type
If these don't work please send us a screenshot with the error you are receiving.
Recent turnitin tickets - Student got 401 error code - Turnitin response it is caused by a communication and authentication between servers, try again at a later date. (well we all know students, and they usually wait until the due date to submit, so they can't wait till a later date to submit)
Other issues
Another ticket: Student error message: "Turnitin Error
Sorry We could not process your request
We are sorry, but it appears we are experiencing an issue at this time. Please...."
My response given about this ticket was :"From time to time Turnitin does run routine maintenance which means the website is unavailable however, there is sufficient notice given to Administrators and the notifications are emailed advising when this will happen. When routine maintenance happens it is advisable to wait for the all clear tweet / email advising the sytem can be used again."
I couldn't find anything anywhere about this student submitting during "maintenance time" I feel like I just get the run around and no real solutions to anything.
Both of these students eventually were able to submit, but I think it is unacceptable for students to have so many issues trying to submit.
One of my colleagues who is also taking a class this semester has experienced an issue of not being able to submit, since she works here she knows all the tricks to try and nothing worked except waiting a few minutes and trying later and then it worked.
@dhulsey Please tell me there is something in the configuration that is going to solve all our problems
Hey, Allison. I notice that the domain field is empty. It should be filled with "turnitin.com." I know for sure that needs to be filled in to launch Turnitin from the icons in Speedgrader. Who knows. Maybe it has other effects as well.
Will that solve all of your problems?
Probably not. 
Turnitin has downtime. Some of it is scheduled maintenance. Some of it is not. Of the downtime that is not scheduled, Turnitin fesses up to the downtime that lasts awhile. You can subscribe to email or Twitter alerts for when they have significant downtime as documented here: Turnitin - System Status. Sometimes, there are short periods of downtime that they do not fess up to. Some of the problems you report may be a result of this downtime, but we do not see chronic or excessive downtime from Turnitin in relation to other services we use -- except Canvas, which is crazy reliable.
Sometimes, simply closing Turnitin and logging out and back in to Turnitin will solve problems. However, for all the times I tell my students not to use Internet Explorer (problems with Softchalk) or to only perform one transaction per session in Respondus or to periodically clear browser cookies and cache or not to use Open Office when the file is going to Turnitin, they will still ignore me and freak out and contact support before doing any of the things I suggest.
One problem that we have seen is students will ignore us about changing their default email in Canvas. Turnitin will freak out if a student changes their default email address in Canvas because the institutional email domain is what Turnitin uses to identify the student as belonging to our institution. Perhaps adding that to your list of troubleshooting strategies might cut down on a few problems, and I wonder about this issue and the server authentication issue you mentioned.
That's all I have without being able to see particular assignment settings. There is no silver bullet here, but I hope it helps.
Hi, Jill! Thanks for the kind words; doing the webinar was fun, and I do hope it was helpful.
Since I never had the problem you describe with the due date / feedback date, I can't be of much help there. Sorry!
I can explain the course copy issue with start dates though:
Previously, the instructor had to initialize a Turnitin assignment on creation and upon import / copy into a Canvas course by visiting the assignment or clicking the LTI button if the assignment was set to load in a new tab.
Now, the only time an instructor needs to initialize an assignment on the Turnitin side during assignment creation or import is if she wants to adjust the optional settings to be different than her saved defaults or if she wants to add a Peermark component to the assignment. For many instructors, this means they will never need to worry about initializing the assignment in Turnitin. Instead, the first time a student visits the assignment, it will initialize in Turnitin -- if the instructor has not already initialized it.
If the necessary information is absent in Canvas (title, points, start date, and due date as far as I can tell) and if the professor has not initialized the assignment in TII, then the first student to visit the assignment will receive an error message instead of being able to access the assignment.
Ha! That seems like a lot to explain something relatively simple, and I am still not sure I did a good job of it. 
Thanks so much for your help, Dallas! (I see the first Q was actually answered in an earlier thread above.)
Just to be clear, when you wrote: "If the necessary information is absent in Canvas (title, points, start date, and due date as far as I can tell)...", you meant the "available from" date for "start" date, correct?
Thanks mucho. Jill
Yes. I should be more careful about the interface terminology.
Here are the current issues that we see (in addition to the above!)
Canvas iFrame: iFrame window too small; confirmation button is hidden (the button after a student has uploaded but not yet submitted). You can't find the button and TII has stated this is an instructure iFrame size issue (height). In the meantime I have made a video that shows kids how to tap on the window frame to get the button to show.
TII Not Syncing Assignment Submissions back to canvas: Does not always sync back to Canvas when a student submits a TII paper.
TII Unrecoverable Error with assignment resubmissions being forever off : Has an unrecoverable error where if a student resubmits and it is within a short period of time (before TII syncs back to canvas), an unrecoverable error occurs where the name of the second file is attached to the first submission/ the first submission shows with the second file name. E.g. Students submits PaperA.docx; then submits PaperB.docx. In Speedgrader it shows PaperA but the file says PaperB.docx (and you download it and it says PaperA). You can wait an hour, day, a month, doesn't matter....the papers are now forever off without the ability to reset. You submit PaperC.docx 1 month later, it then will finally show PaperB with the file name of PaperC.docx. VERY bad.
Hi, kdemello. I find Turnitin (and most other external tools) works best when I load it in a new tab in my assignment settings. I have heard a few times of Turnitin not totally displaying if you load it inside of Canvas instead of a new tab.
The biggest problems I have seen with ctitiques is that students are not sure about the process. Here is the tutorial I use to show my students how Peermark works: https://www.nmjc.edu/userfiles/dhulsey/LTI/peermarktutorial.pdf
Perhaps that helps?
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