It looks like when you export a Scene, it creates a temp file (named something like "vred_tmp27.fbx"), then renames it to the name the user selected. The problem is that if the target location is within a Dropbox folder, as soon as this temp file is created/copied from somewhere Dropbox will immediately get its handle to index it and do its thing. VRED will try and fail to rename the file to the target filename now, since the file will be in use during that split second, leaving the file named "vred_tmp27.fbx" or whatever You guys can probably fix this by creating the file directly with the name the user chose, or renaming it before copying from whatever temp folder you're using
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