Hello, a few options:
1. Quickest is to try kuler on another browser.
2. If that doesn't work, have you tried some of the
troubleshooting options in
This includes manually uninstalling and reinstalling the
Flash Player, as well other tips depending on what browser you are
3. If you try the manual uninstall/reinstall and it's still
not working, please let us know what version of browser/OS you are