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Your domain could be banned form Google.
It could be that your looking at the Toolbar PageRank which isnt a true reflection of your pagerank.
Google may have found the link to your subdomain, passed PR value but the googlebot has yet to reach your domain.
Have a look at some previous comments:
If it's due to this current bug at Google, I expect it'll get resolved within a few days/weeks.
Additionally, you didn't add a META tag onto the page to direct the search engines not to display the cache, did you? If so, you could've caused the cached version to be unavailable.
<META NAME="ROBOTS" CONTENT="NOARCHIVE">
We go to a page at subdomain.yahoo.com, it has PR3, but when I try to see the cashed snapshot of page, it did not match any documents.
A Page can be have PR3 but not cashed, why?