I logged in on the management server itself, ran the SEPM on the server with the admin credentials having the reporting trouble. Report schedules/filters/etc were modified and resaved on the server. The reports ran again, on an hourly schedule for testing and the query dates FINALLY changed on the report.
I don't know why, but it appears to have fixed the issuse. We will know more tomorrow when the regularly scheduled report runs. We may have just changed the "stuck" date on the query from Dec 2/3 to Jan 4/5 but I am hoping for the best.
I'll update the thread tomorrow. Strange that it is/was only affecting this one account and PC. Other admins reports are all working fine, including mine - which have way more information.