Version 1.11 of T2M2 has a bug in determining whether the current user is in the admin group, which erroneously fails if the user is a member of a very small number of groups, which is unusual but prevents those users from running the app successfully. Thanks to Joe for reporting this.

T2M2 version 1.12 fixes this, and is now available from here: t2m2112
from Downloads above, from its Product Page, and through its auto-update mechanism.