QuoteDuring playthrough... The error says this:
What was the crash? In the editor? In the engine? Do you have the crash printout anywhere?
An internal error has occured. Please note down the following information.
If the problem persists, contact Chris Jones.
(ACI version 2.55.534)
Error: prepare_script: error -2 (no such function in script) trying to run 'region2_a' (Room 11)
Quotefunction hotspot3_a() and function hotspot4_a() (I have two different hotspots that do the same script, but have a different displaymessage to begin with, so they have to be two separate hotspots). Interestingly I've done a bit more testing and if your character is outside the walkable area (and therefore I assume the regions) it doesn't crash. To do this I merely skipped to the room from an earlier room with my character in a different position in the first screen. Then skipping back, moving my character back to where he would be in the walkable area and finally teleporting back to the room in question made it crash, so I'm pretty sure it's just being inside a walkable area that causes it.
Can you open up the room script (from the Room Settings pane) and see what function name that script code has been placed under?