The problem is that the preview is a white screen
when i make a new layout in Windows Vista
i am running Firefox 8.1.0
thank you for helping me
It could be anything. Probably a third party plugin that went wrong or you may have even discovered a C2 bug.
Use ctrl + shift + j to bring up the error console and post it to get better assistance.
it shows this
<img src="http://dl.dropbox.com/u/46771759/errors.png" border="0" />
Unfortunately, I am not one of the ones to interpret the error console. You'll have to leave that to a pro ;)
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None of those errors are related to c2. The relevant error would be at the bottom of the list, but if there was an error the level would be grey not white. Did you add anything to your new layout? C2 previews on the currently selected layout, so if you didn't add anything you will just see an empty white layout.