Just upgraded to 3.6.10 and I get the error below if trying o leave a comment to a photo.
Running Photopost 6.02
Everything else seems to be OK as far as I can see.
"Your submission could not be processed because a security token was missing or mismatched
Update: I was wrong, get the same error when trying to upload.
Update 2: Found that Inferno CSRF Auto Protection hack was causing the problem. Removed it and Photopost is working correctly now, sorry.