We are having an issue with a particular .dwg file disappearing completely from our network folder. As in, the file is saved and closed at the end of the day and is nowhere to be found the next morning. Fortunately, between the .bak and .sv$ files, we are able to recover our work and create a new .dwg file. Then, the next morning, it is the same story: the recreated .dwg is not there. Is there some obscure setting/variable that would cause this? Our IT provider will be checking to make sure that it isn't a network issue. Since the .dwg file in question was created by importing CAD files from other sources (architect, engineer, and surveyor) and this isn't happening to all of our .dwg files, I am wondering if there is a write-protection/save/lock setting that was activated in one of the second-party files.