This is exactly the problem I have. I'm sorry I have no answer - I don't think I've ever had anything like that happen to me before. Hoping someone else knows...

I did seem to find a solution, though I don't know how...

Problem solved when I inadvertently reloaded ver. 6. I did not uninstall previous version, and I somehow ended up at ver 2.0 for awhile! Managed to delete that and eventually ended up at a working broswer -though not entirely sure what happened. (It also asked me to update Flash, which I had just done yesterday, but did again...)

I thought I had lost the bookmarks, but using the import bookmarks button, I could use the ones from several days ago.