Trying to render a 9 minute screencast for my students. Stuck on 100% rendering, waiting for an hour did not work, so really stuck. Tried lower quality, lower resolution, different subdirectory, nothing helps. Wasted half my day today, can't have such inefficient process, got more to do. Anyone knows a solution? PC has a recent i5 processor, 16GB of RAM and plenty of hard disk space, is only a few months old and up to date with all updates.