Let me guess...you either copied abunch of plug-ins from an older install or pointed CS6 to your earlier plg-ins folder?
You can't mix and match old Photoshop plug-ins with the new CS6. Either remove all the older plug-ins or uncheck the option to point to another plug-ins folder. If you have 3rd party plug-ins you want in CS6, the best process to get them installed is download the most recent versions and use the developer's installers.
Yes you are partially correct I did go to each of the developers site and download the latest versions of the plugins Just forgot i will have to wait a few months before they will catch up. But to be fair the files format plugins have been fairly forgiving in previous versions obviously not in this. I keep on having to remind myself just why i have all these versions of photoshop on my machine.
Never mind its great paying for a the complete work flow solution that falls down beacuse thirdparty developers are not up to speed ie Font Management maybe that something you should bring in house
Third party plugins probably won't cause this -- the usual cause is copying Adobe plugins from a previous version of Photoshop.