I'm using the ebay plugin m2e pro, and since the 7405 patch, orders are no longer recorded in my magento admin. I'll post there too, but thought I'd leave this here in case someone else is having this problem.
Magento 22.214.171.124, all patches applied.
We're having the exact same issue - no order synchronisation seems to have completely stopped since the Patch was installed. Did you manage to resolve this?
It ended up that my subscription to m2epro wasn't set up right like I thought it was. Check with the m2e pro guys and they'll get back to you quickly. (they went to subscription mode in dec I think, and I fit in the "free" package. good luck :-) )
It turns out it was a crashed table m2epro - operation - history - this just needed to be repaired and all was fixed.