Scenes won't execute, H3PC

Pre-programming for a big NYE show, using lots of Scenes. Been working on it for a few days, everything going fine.
Suddenly, now once I touch a Scene after launching my show, I am unable to run any other Scenes. It executes he very first Scene I touch, then subsequent Scenes do nothing.
Perhaps related, I am unable to release any Scenes either. Now, I'm not sure it works the same way in H3PC as on the real console, I've done little significant programming in H3PC before now, but touching a Scene then Release does nothing. Neither does doing a Pig>Release. Am I correct in assuming Pig>Release should release all Scenes as well as Cuelists?
Going back to an older backup made before the problem began I have the same problem, which I'm afraid may indicate a corrupted show.
On actual consoles when I've had issues like this I've ended up needing to reinstall the XPE image, is there a similar operation for H3PC, or just reinstall the software?
Maybe, hopefully, I just touched a wacky button somewhere and the issue is operator error?
Any help appreciated, load in starts tomorrow!!
Related