Hey - turns out IRC is out and something a little more modern has taken it's place... A little thing called Discord!
Join our community @ https://discord.gg/JuaSzXBZrk for a pick-up game, or just to rekindle with fellow community members.
If so, then it's pointing to an in-game fault with the BreakingGlass actor vs the demorec device, so I'll probably end up writing my own to replace it in the next version which effectively doesn't spawn the glass bits when offline.
I think someone mentioned that UT can crash if it needs to add to many objects to a dem file?
wild guess though