Has the user tried a different browser (if they're using FireFox have them try using Chrome or Internet Explorer or Edge) to see if the issue is cross browser or a local issue with their browser?

Have you tried the "Become this User" function and attempt to change this setting for the user and see if it sticks?

I am a Web Development Contractor, I do not work for UBBCentral. I have provided free User to User Support since the beginning of these support forums.
Do you need Forum Install or Upgrade Services?
Forums: A Gardeners Forum, Scouters World
UBB.threads: UBBWiki, UBB Styles, UBB.Sitemaps
Longtime Supporter & Resident Post-A-Holic
VNC Web Services: Code Modifications, Upgrades, Styling, Coding Services, Disaster Recovery, and more!