"Google" requester help and information:
1) Do NOT return any HIT by a Google-associated requester or you MIGHT BE LOCKED OUT of that HIT for the duration of said HIT's timer, AS WELL AS locked out of any OTHER associated requesters HITs. For example, if you return a Sergey Schmidt HIT with a 2 hour timer, you might be locked out of Sergey Schmidt HITs for two hours, ALONG WITH Project Endor and Peter Burke HITs for 2 hours.
Disclaimer: It might be safe to return certain HITs without being locked out, but try asking the forum or working on any errors before returning unless you're willing to risk it.
2) These HITs often must be completed in the order they were accepted, but there are exceptions. For example, if you accept a queue full, you often must work on the first accepted or will encounter errors. If the first accepted isn't working, a single HIT in the group should work, and you might need to go through multiples to find the working HIT. Try the last HIT, or if you accepted groups at different times, try the first from the next group, etc.
3) If you encounter an error telling you to refresh and think you're on the correct HIT, refresh the page, or try right clicking and reloading the frame. You might have to try this once or twice for each HIT. One HIT should always be working, so don't return or you might be locked out.
4) Some batches from these requesters will have a limit on the number you can complete. Sometimes it's one or two, other times 100. You will receive a message stating if you have completed the maximum, so never fear to accept a bunch and keep working. It will tell you when you've hit any limit, if there is one. Accept and put money in the queue first, return later.
Common requester names: