I am on v10.55 and I also tried the latest version. But just an hour back Joomla K2 module stopped working, I am only getting no engine matches error. I request you to please have a look.
If you get the same with a very old version then Im sure it's not a fault of SER. Especially as I just tested some of the engines and they all produced a fine backlink.
So I would guess it's some block in firewall or bad proxies.
@smartseo I just got some K2s and ran them through a test project, it is submitting fine so the SER site is fine for submission.
That said though it has no verifieds, perhaps the K2 engine has gone the way of Easyblog, Catalyst and a few others and has died for SER usage , just a theory though as I only done on initial test batch.
Not sure how K2 works, is it like an addon to Joomla like Buddypress is for wordpress? If so Joomla 3.6 was released around a week ago, maybe it is filtering out to the blogs and countering SER.
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So I would guess it's some block in firewall or bad proxies.