1, 2015
As of Tuesday night, the API copy call returns 500 errors for paths which are folders and contain images. Removing all images solves the problem in the cases we've tested.
I just found out that changing the extension of the image file (.jpg tested) to something like .notjpg doesn't cause the 500. Obviously, this isn't a solution but hopefully it sheds some light on the issue.
[Moved to API Development forum]
Thanks for the report. We're aware of the issue and expect to have it fixed later today.
Any updates?
This should be fixed now. Please let us know if you're still seeing any issues.