Trouble in Blogville...

Seems as soon as I fix one thing, something else starts happening... I don't know what's going on now, but if someone out there has a clue how to fix it, I'm listening!

Here's my symptoms:

From my dashboard, if I click my own blogs or one I follow, they show up as though I'm not logged in. On the top right, it says, "create blog/sign in". There is no 'customize' link. I cannot leave comments on many sites. Seems the ones with a pop-up box work OK, at least so far. But the comment boxes on the post page do not. It will show me as not signed in. If I type a comment and click, it will ask me to select a profile. I'll click 'google account' then 'post comment' and it disappears, never to be seen again.

I've clicked to follow a couple of new blogs, and my profile pic shows up as a box with a red dot in the center. Weird, huh?

I left myself a couple of test comments and they worked, but I use the pop-up box. But I can't delete those test comments. If I click 'sign in' it takes me back to my dashboard. Yet, when I click out of the dashboard, I'm back to not seeming to be signed in... I'm caught in a vicious cycle!

Any advice would be greatly appreciated. I'm using Firefox browser on a Vista PC.