Photoshop problems please help!

I was working on some wedding photos and all the sudden I was having issues with my actions showing in the actions dialog box, it just went gray and I couldn't use any actions. I also had one action that I use quite frequently shut down photoshop every time I tried to use it. What is going on and how do I fix it? Thanks!

A bit more info?
What action? What version PS? 8 or 16bpc file? Any error messages?

It was a dragonizer action and when I try to run it I get an error message that says it could not complete the action due to program error. Here is an image of what the action dialog box looks like when I open photoshop now. It does not display any info on action so I can't run any. I can pull up the list of actions and select one but nothing shows in the box. I am using CS4

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Did anything change on your machine?

You might try to reset the PS prefs (you might loose stuff you didn't save, such as shortcuts, settings, actions, workspace etc!)

Start up PS while holding Shift+Cmd+Opt.

As far as I know nothing was changed. I will back up my actions and scrips and try that. Thanks!