New Posts not allowed while signed in ??!?!

This is a strange one. I was logged into my gmail account using chrome and I did a search for my blog. (What do you expect? , I’ve not updated in months!) And I couldn’t log in. Instead they tell me to clear my cookies and some other instructions. 

I didn’t do any of that. Some random clicks later and I’m here editing. Very strange…
Now why did I come here? Ah, yes, I wonder if I can post files on the blog here? Some Perl source code specifically… I see no obvious links, so this requires investigation.