I am new to Simutrans, but there is one bug that's so annoying. Whenever I get a convoy, and I change the minimum load to 100%, sometimes a little window pops up saying there is a fatal error, and to report to this forum. Then another window pops up saying Windows is looking for a solution (my computer has Windows 8 :-[), and then I can click only cancel. Then simutrans quits. What really stinks is that is I didn't save the game. :-[ This happens I think only happens in the depot, and the convoy has been outside all ready.
This seems to be not pak128 specific.
Sorry for the crash you are experiencing. Any additional information you can provide could help to find the error and fix it.