Dialog Toolkit Plus isMainThread Error

I’ve not been able to understand all the posts on this thread but, in case it’s relevant, I found last year that editing DTP 1.1.3 in Script Editor works but editing in Script Debugger results in the “NSThread doesn’t understand the “isMainThread” message” error. I could not find out why. But, I’ve not had the error since.

@dean one other thing you could test: change the OSAAppleScriptObjCEnabled entry to NO. If the value is being read, that should guarantee 100% failure rate. If it works at all, it would suggest something more complicated is going on.