I was trying to update to the new version of Hybrid Theme (0.5) and I had a problem with that. For some reason, the preview page would simply be blank. When you take a look at the source for the page, you do see a single html comment that mentions that the page was not cached by WP Super Cache.
I tried to disable WP Super Cache to see if that was the problem. It didn’t make a difference in any big way; it simply made the html comment go away. That wasn’t good enough.
I also looked at the other themes I have in my /themes directory and I found that both default themes worked just fine. Not sure of what to make of that.
Not wanting to risk a bad theme-install since messing with these themes sometimes aren’t easy, I gave up for now. I’m going to wait a bit until someone posts something about it or until Hybrid 0.6.
Update – April, 6th
I was just alerted that there was a newer version of Hybrid theme, 0.5.1 and after downloading, uploading and activating it, I am pleased to say that it worked without problems. The preview is pretty misleading.