Site missing in Yahoo - using Firefox

Firefox, IE

[longen]

When i try the site:www.domain.com command in Yahoo, using Firefox, my sites appear to be missing from the index. It says "We did not find results for "site:www.domain.com".

But if i enter the same command using IE my sites are listed as normal.
Any ideas?

[physics]

Did you try deleting cookies and clearing the cache and restarting Firefox?

[longen]

I cleared the cache earlier without effect - but i i've just tried the search again and the sites appear with FF, so probably a problem on my pc.