Hey, no worries, thanks for the feedback. And yeah, by removing the payload, it runs fine. 1.2 works fine for now, I'll stay on that.I found the problem. Unfortunately, this is a bug in the new version, in the code that is strictly specific only for Orbiter 2016, that causes problems with non-VM vessels - like ShuttlePB in this case. Orbiter 2010 should still be OK, but for 2016, it may be needed to use the previous versions for custom payloads... until the new fixed versions will get out.
Sorry for inconvenience... :-(