I've been working with a user through his approvals, When he clicks on any of the 41 red specs (all GSM) on his action items dashboard, he gets the “You do not have permissions for this item” window. But if he clicks on the spec in the green section, he can open it.
I tried to work around it by granting a temporary signature authority from that user to me in GSM, but it didn't work.
His permissions were updated through UGM. He was added to the GSM/Global group. This did not fix the problem either.