No Cache?

This is a little odd and is something I can’t recall seeing before. Currently (at time of writing) google has no cache for my homepage, though it does for others - like my about page for instance.

I’ve checked my webmaster tools account and that all looks fine. The site is certainly being indexed because my last post of only a couple of hours ago has already been indexed and is searchable - which is fine. Visible pagerank as shown in my toolbar is 4 and not greyed-out or anything.

I’ve just tested for an iffy robots.txt via webmaster tools and that’s fine too.

I upgraded to wordpress 2.5 yesterday but then I’ve upgraded other sites and they have cache.

hmm? Not sure if it’s just a temporary blip or a problem somewhere?