My VivoTab is about four months old now. A few days ago something strange began happening. When I grade a paper using the MetroUI pdf reader (which is the only one I have found to allow reasonable writing), and I save the paper it seems that the Explorer is very very slow on catching up with that. It shows all the tmp files, even after they are essentially gone. I'm not sure if that's a problem with the eMMC itself, or with the Explorer, or how to correct this. For what it's worth the work folder is within my Dropbox folder, but if there were issues like that I'd expect the .tmp file to be uploaded and deleted -- something which does not happen. Also I just checked with the Dropbox on pause, and it still does that. My money is on a software issue, but I have no idea what it could be, or how to trace the problem.