I shall let myself know. I'll check teh sounds, but I don't get why it doesn't work on your patch pack.
Sorry, didn't know that it was your GRF.
The sound in question appears to have 2 channels.
I've added some checks which log a suitable error message instead of aborting.
It'll be in the next release.
I think I made something of a mistake. I changed the daylength in one save, and when I opened another save it had messed with all of the timetabling and dispatch scheduling in that save, despite the daylength being the same. Is there any way to fix this without deleting all of the schedules and starting over?
I'll look into it, if you could post the savegame that would be helpful.
I'm not sure that I understand what you have done.
If you changed the day length and then overwrote your good savegame with it, then yes, you will most likely need to adjust scheduled dispatch start dates (i.e. by using the start date button).
If changing the daylength in one game and loading an unrelated game somehow adjusted your scheduled dispatches in the unrelated game, relative to just loading it directly, that would be a bug.