I just ran the Support Tool at Version 1.5.3.749 and let it reinstall Malwarebytes. Still at the same version/update/component level after reinstall.
The issue is resolved after a support tool clean install.
I can't have customers do this on their own, and each machine has User Access enabled/password protected for all settings, different time schedules per machine (Quick Scan Daily, Threat Scan Weekly) etc.
Hoping for a fix in a future update. Since this is minor and there is a work around by just closing the UI and reopen, I will wait for a fix via updates (less impact on machines/clients and me trying to do a support tool cleanup everywhere).
Thank you for the quick responses and suggestion.
Glad you confirmed the issue also, on another client of yours, even at a different version (i.e. with beta update).