I want to choose an file extension in the "Save as" Dialog. If i choose Jpeg, Photoshop takes EPS and so on. Systemupdate and reinstall PS does not help.
My System: Mac OS X 10.6.8
Are Photoshop and OS fully updated?
As with all unexplainable Photoshop-problems you might try trashing the prefs (after making sure all customized presets like Actions, Patterns, Brushes etc. have been saved and making a note of the Preferences you’ve changed) by keeping command-alt-shift pressed on starting the program or starting from a new user-account.
System Maintenance (repairing permissions, purging PRAM, running cron-scripts, cleaning caches, etc.) might also be beneficial, Onyx has been recommended for such tasks.
Weeding out bad fonts never seems to be a bad idea, either. (Validate your fonts in Font Book and remove the bad ones.)
If 3rd party plug-ins are installed try disabling them to verify if one of those may be responsible for the problem.
Everything is fully updated, and i use Onyx to clean Caches but that do not help. I have no 3rd party plug-ins in CS6 and my fonts are "clean". But to Start PS with command-alt-shift pressed on starting helps. That's all i have done. Also a other problem with PS is now repaired.
You probably set the Additional Plugins Folder preference and pointed it to an older version of Photoshop by mistake -- loading duplicated plugins, which cause this problem on MacOS.
Copying plugins from an older version: BAD idea.
Read what Chris Cox wrote carefully.
You have copied plug-ins provided by Adobe with a previous version of Photoshop into the plug-ins folder for the new version.
Reinstallation does NOT wipe out copied plug-ins, so it will not help.
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