Hello again,
We have updated the plugin to (v.1.2.0) have compatibility with YEP Extended Message Packs 1 and 2. Still looking into the compatibility issue with YEP_X_CoreUpdatesOpt as it seems to stem from a separate problem, so we would recommend turning it off at least for now to see if the first issue has been resolved. Let us know if the new update resolves the first issue or if its still persists :)
Thanks,
MythAtelier Team