The loop in AcpSequencer.cs where up to 15 tries to start the script are made is broken!! I left a stray return false statement in there that I was using to test.
Will be for 3.5.4 (HF2) but that needs to be built, etc.
This was caught back in mid-May and it affected John Gross who seems to have a slow machine (a VM running on Linux). Just cleaning this up and committing now.