After upgrading to 1.0.0rc1, I can't seem to be able to drag and drop within the middle column of the zotero window. When I try to drag a pdf file snapshot onto a reference entry, I get the error message "The following files already existed in the destination directory and were not copied." This message pops up right when I *start* dragging, not even after I've released the item. This didn't happen in the previous version. Any thoughts?

Thanks for the bug report. We have confirmed this problem under Windows XP and are working on a fix. To close the warning message, try pressing enter rather than clicking "OK."

You cannot drag a collection onto My Library. My Library displays all of your items, everything you have collected. Try dragging a normal collection into another collection. This should create a subcollection. As to your second problem, draging items into collections. If the item already exists in a collection you cannot add that item to that collection for a second time. Does that solve your issues?