Hi folks, we also use google docs embedded into our courses for just about every assignment. We like the functionality of these google docs because it allows you to update one master doc and it can update in every course. This is helpful when you have multiple courses being taught under one umbrella. The update in one google doc shows up in all courses since it is an embed. We have the same issue with a link inside of the embedded document. Some sites will display in the canvas window by enabling mixed media content. However, if it happens to be a link to another google doc it will not work unless you right click to open in a new tab. I also have not found a way to tell a google doc to open a target in a new window.
The only fix I have made is to go below the embedded document and type "If the activity link in the assignment above does not load properly, click HERE". Then I go to file upload and link the document to "HERE" so the student has a back up. Not idea, but he best band aid we could think of.
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