I can't help with the log files, but I have had similar behavior from my EQ6-R Pro with it starting to flip and then just stopping. A subsequent GoTo command put it on target on the wrong side of the pier.

So, after reading some other forum posts, I now have the meridian flip set to trigger at + 0.2 hours instead of the default of 0. At that hour angle, the mount has no doubt that it is past the meridian, so it completes the flip.