Error making lot: Failed sanity check: count($items) <= 10

This comes up a lot when trying to make a trade. Once that comes up you can't click on any of the links (- Index - New Trade - My Trades - My Offers - Search Lots - Recent Lots -) to try again. Only a broken image icon comes up. You have to refresh the page to try again and not always are you lucky.

I have tried clearing cache

The error comes up when you don't select any items to make a trade with, sometimes it can be a bit thingy about boxes being clicked properly. Most likely it breaks the coding for subsequent page loads, hence the need for a refresh.

the crazy thing is is that I did have 10 items selected O_o

It happened to me twice today as I was setting trades up...both times I had items selected

Possibly more than 10 then? I just managed to replicate what you've described by trying to make an 11 item trade.

Maybe that could've been it but I can't remember now XD

I did notice that selecting items was a bit jumpy/laggy... :/