I have MBAM installed on my father's computer, and I have him use a non-admin account. When I log in with my administrator account, everything behaves correctly, and a scan shows no threats.
When I log in with my father's non-admin account, MBAM uses 50%+ CPU constantly, with no disk access. There's nothing installed other than Office on that computer. It's Win10 x64.
I've tried uninstalling/reinstalling and it didn't help. If I start Windows without MBAM starting, and then run MBAM from the non-admin account, the same thing happens.
Other than MBAM, nothing is using appreciable CPU on the user account, so I can't see any obvious apps or services that are conflicting. Absent any guidance, the only thing I can think of next is a Windows refresh install.