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I had a simular problem, and found the solution reading all the messages about upgrads. However for the life of me I can't find those post for you.
Anyway here's what I did.
Update the group modules permissions for admin. You don't need to change a thing just select admin group and click submit.
Next update you system module. I also made sure each module was updated, and my templates also.
The tricky part was getting to those areas to do the update. Hope this jogs someones memory and they can point you in the right direction.
Hope I'm helping.
don (el paso)
motto - green chili for everything!