XP10 Gizmo has no knowledge of your 11 install... even if it did, it would NOT object to it by design. Perfectly acceptable config.
As for the bug, I had a quick look and my only real suspicions are either JAR Ground Handling or X-RAAS which is running under FWL.
...root cause, not really sure, the IXEG systems are throwing a stack-overflow inside Lua for unkown reasons.... not enough info to say much more.
Thanks for your patience.