I have PS 6 and just purchased an iMac and am running OS 10.10.1 (Yosemite). When i try to Save or Save As a file I get the following message: Could not save as "Whatever.psd" because this file is locked, you do not have necessary access permissions, or another program is using the file. Use the Get Info command in the Finder to ensure the file is unlocked and you have permission to access the file. If the problem persists, save the document to a different file or duplicate it in the Finder. Any suggestions? Thanks.