Hi! Having the same problem here but Vlokki's solution couldn't help. My OS is ubuntu 12.10, the second OS is Vista SP2. What do you mean by folder being locked or in use by another application? Could it be playing the audio files from the shared folder for example? I don't think location could be the problem since the folders I share are on local hard disk and on an external (USB). And as for type of user account, there's no admin on ubuntu, so... Any idea?