If you are sure that URE Pro is involved, try deactivate URE Pro. Will ‘reduced permissions after login’ issue will go away?
It would be related to some caching issue:
1) Client side: what if user will try login with another browser, of browser with fully cleared cash or even from computer which was not used to login to this site?
2) Server side, try to fully clear caching plugin you use at your site. Will it allow to admins make fresh login with right permissions?
3) If you use CDN cache, try to clear CDN cache.