I have been trying to use they very latest version of SolveigMM Video Splitter v3_6_1301_16 under Windows 7 Pro (64 bit), and it is horribly unstable. This is on a nearly brand new HP Elitebook laptop (8 GB RAM).
So far there is no rhyme or reason to the instability: the program very frequently locks up when it starts up, it very frequently locks up when writing a trimmed video out again. AVIs, MP4s, etc, all can have the same instabilities / lockups. One video can work fine one time, but lock up SolveigMM Video Splitter the next I load it. When the program locks up, it might take 5-10 or more close downs / re-runs before it will then finally run again.
I am happy to supply any more details you need, provide sample videos (although the instabilities / lockups can happen to every video I have tried - dozens), and/or I am happy to run a special debug version of SolveigMM Video Splitter on my machine if you need to gather run-time information, or run any tools you want to get to the bottom of this.
Moose