I'm using PS5.1. When I try to Save for Web & Devices I'm getting write permission errors. I haven't used this application for over a year, but it used to work fine. I'm not sure what changed.
I also used the Mac Disk Utility to Repair Permisions, but that didn't help.
Have you tried signing on PS as Admin?
The problem could be related to Mavericks permission problems. You can try the Bridge fix:
Open Finder > (go) Computer > Macintosh HD (for me) > Users > Click once on the Home icon (main admin) > Get Info >
click on lock and authorise bottom right > click on cog wheel drop down > click on 'Apply to enclosed items' > OK