SignalTap Advanced Triggering Bug

Well, at the very least, this is a runtime configurable option (all white fields in the advanced trigger GUI are), meaning you can change the equal to greater than during debugging without having to recompile the design, so you don't have to cancel your current compilation if you see this weirdness.

As for why this keeps happening, I don't think this is an issue with the older version of the software because this feature has been there forever. I'd probably create a new .stp file. Perhaps your current file is corrupted somehow.