Exclude Applications (Instant Hijack Only)
If you're using the Instant Hijack component, and you're experiencing problems with specific applications, you can try excluding them. Nicecast will not affect any excluded applications. To exclude an application, open the System Preferences and go to the APE Manager. Click Instant Hijack Server and add the application to the Exclude List. Once you restart the application, Nicecast will no longer be affecting it at all, and you can be certain any problems you're experiencing aren't related to it.
Delete Preferences
Try the old OS 9 standby of deleting the application's preferences. On your OS X hard drive, go to your User folder and open Library/Preferences (~/Library/Preferences) and delete the file "com.rogueamoeba.Nicecast.plist".
Check for a messages from Nicecast
Did Nicecast give you an error messages? If so, pay attention to them! These error messages are designed to tell you something is wrong, and to help us diagnose the problem if you can't fix it. You may also see error messages if you check Console.app (located in /Applications/Utilities/Console).
If all else fails...
If these steps haven't fixed your problem, please (please!) email us for support. Send mail to nicecast@rogueamoeba.com, and we'll try to get your issue solved.