Just added X13-mod (named "marucoin-mod" for now).

dhsc19: it could just be related to TeamViewer. it would be easy enough to find out since you say you can always reproduce it - simply reboot, do not run sgminer at all, use TeamViewer and do whatever causes the problem, and then start sgminer. if you still get a lower hashrate then sgminer can't do anything about it.

Old sgminers and cgminer 3.7.2 did indeed have leaks on the GPU, but I fixed them a few months ago when I did the "hot-switching" between Scrypt and Scrypt-N. So any semi-recent build of sgminer should not have leaks on the GPU, it is probably something else.