When importing photos and videos to Lightroom from disk (copy, add) from a particular directory, the import of the .mov files would fail with a message indicating that the connection was lost with the dynamicmediaserver.exe process. Once the dynamicmediaserver.exe process hung, I had to kill the process to get Lightroom import working properly again. However, every time I tried to import .mov files from the particular directory, it would hang again. The problem appeared to be a very small .mov file with only a single video frame. When I removed this file the dymanicmediaserver.exe process would not hang, and the import proceeded normally.