@flagmax
After several days of repeated installing, uninstalling, running, shutting down, resetting... even uninstalling and running the phone for a day before reinstalling ... the result is still the same.
SP2.33 display is inverted in portrait mode, and correct in landscape mode.

Regret that I cannot report good news.
Thank you for your efforts, but I'll have to use SP 2.35 in portrait mode until a solution is found.

(Nexus 5 unrooted running Lollipop 5.0 OTA)