@A_Matos Thanks! I just tried those same options a few times myself in the same version of Internet Explorer though, and I didn't see this issue. That seems to indicate that this issue may be specific to something on your site, especially since you don't see the same issue with the demo.
To confirm, can you try my sample here: https://jsfiddle.net/dbapitesting/k4snq2og/ ?
If that doesn't display the issue for you either, please share a sample page of yours that does so we can reproduce it.
@Greg-DB Sorry for the late response. It is not easy for me to present an example because the dropbox integration is deeply integrated in our webapp that is not publicly available. I do have the same error as @A_Matos though on your example.
EDIT: I have another colleague which I have sent your example to. For him it worked once. Selecting another file resulted in the same error. This is consistent with my findings in our own app. Sometimes it works (I thought I had pointed it to the fact that if I logout of dropbox and than select a file. When already logged in it never works for me). My colleague did log in the first time when in worked. Hope this helps in finding the cause.
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