Originally Posted by
TowinDaLine
I'm not one of the gurus on this forum, but have had a similar situation (and I have the same setup - LQ4 / 4L80E)
I have the MPVI v1 Pro, which allows logging without the laptop.
First couple of times, it logged just fine. Then I added a bunch of additional parameters, and it stopped working (although I didn't trace mine specifically to putting the truck in gear, like you did). I figured it was a buffer overrun, as the Pro OBD plug has a finite amount of memory (I had just about everything selected).
I can still log in the traditional way (laptop connected), so I didn't pursue it. But if you are using the Pro & remote logging... maybe this will help you track it down further.
Oh, and AFAIK, I had the latest firmware, etc., installed. I'm using the v3.16 (?) software on the laptop for my own tuning, which was the latest 3.x version at the time.