We have deployed some updates. This should be fixed now.

The one it's currently happening is the ruby "Retrieve array value by index default" http://www.codewars.com/kata/515ceaebcc1dde8870000001/train/ruby

But it's happened for most of the katas I work with. Looking at the network logs I see a lot of these

Request:
GET /djax/cache/9STn-d6z

Response:
{"success":false,"dmid":"9STn-d6z","deferred":true,"valid":false,"reason":"There was an issue with the server response. Please try again.","output":[],"wall_time":null,"errors":[{"reason":"There was an issue with the server response. Please try again.","fields":[]}],"message":"There was an issue with the server response. Please try again."}

what kata is it?

I keep running into an issue where my submissions time out when I run my test or submit, after which there doesn't seem to be anyway I can get it back working. Everything else loads super snappy and I'm not have any connection issues, any tips for troubleshooting and/or working around this sort of thing?

I've invited a friend of mine to the site using a referral link. He has already registered and confirmed his email (proof: https://pp.vk.me/c618129/v618129939/627d/lNH4cnWiQqU.jpg), but I still see him as an unconfirmed at my account page (proof: http://i.imgur.com/CJDat72.jpg). No extra honor was given aswell.

Lots of katas (e.g. this one: http://www.codewars.com/kata/52996b5c99fdcb5f20000004/train/ruby) have a note about default test cases uploaded with them at the "Your test cases" section of the site screen, but it seems like I'm not able to see even a single one. The input field is just pre-populated with commented manual about testing methods.
Here is a screenshot of explained behaviour: http://i.imgur.com/2MFR6Uf.jpg
Tested with Chrome 34.0.1847.131 m, Firefox 29.0.