Co-Op save problem, please help!

Ok so basically this has been going on since the first time i played co-op in the TPS. After i save and quit and exit my game, i come back in and i am at the level i started the last play session in. I have fixed this before by just using the gibbed save editor and giving me back my level, but now that editor isnt saving, so basically i lose my level and my guns every time i play co-op after i save and quit, please can someone help me fix this problem?

ok update, i got gibbed working again, but please someone help me with the co-op saving problem

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