Could not save because write access was not granted+lightroom 4.2

Hi

I use Mac osx Lion and LR 4.2 & PS CS6 and a network atorage when open a file whit LR in PS after edit file don't save or save as whit orginal name in network storage and show  "Could not save “...........” because write access was not granted" and I have to close LR save file in PS to network storage and reopen LR.

But when I send a file in LR whit Open finder to PS ans save to network storage evreything work ok but I have to do Sync again lightroom.

I think somethink don't work correct in LR .

Do evreybody have this problem?