I've never seen this before in vanilla Simutrans and this is my first game with Experimental, so...
The message "Maximum of 254 stops in a schedule!" keeps popping up about every 5-10 seconds in this game, making it impossible to play. It's something in the save, which I can include if desired, because it happens even after exiting the program and reloading the save, and doesn't happen with other saves. I'm not sure what I did since the previous (still-working) save... if I recall, I didn't do very much.
TygerFish,
thank you very much for your report. Could you upload the save so that I can see where this comes from? Thank you :-)
Link:
http://dl.dropbox.com/u/7182124/pak128B-ex_254_stops.sve