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This is a known issue, but only on certain instances. See this issue link for the Sage notebook.

In particular, this should only be an issue on machines running the so-called "flask notebook", which is not part of a standard distribution. This would pretty much be just the Sage servers ending in 'sagenb.org'. Is that the case?

Note that having your collaborator send you the direct link to her worksheet should work. Also, the test server has this fixed, and it will be fixed soon on other machines. This should not be an issue on any local Sage installation of your own.