It does look like a GUI bug. The graphs show up at the beginning of the time lime if it close and reopen QGC or if I reload the same log file. Otherwise each successive "show curve" starts off at where the last one ended - interval wise.
I am using Win7 32bit. I did have rendering problems (green shapes) in the HUD but was able to make it go away by going into Nvidia settings and enabling "Extension limit".
Below are the results of the 2nd static logging. Ziplock bag, no silica gel. Same location in my basement. Only obvious difference in the process and conditions is the opposite corner is pointing down.
It's back in the freezer. Will re-do first orientation again next.
Thanks,
- Felix