That's interesting; I might as well try your approach, since mine is not working. I was starting by clearing cookies, then trying just one of the SSI surveys (whichever one was green, or the SSI first, if they both were green). Then I'd wait (do my e-mail, etc.), then clear cookies again and do the other SSI, then try the other surveys. I've never hopped back and forth - I stick with one survey category until I either complete one, or get the "we don't have one for you" message. Then I check it off my list, and try to the next survey category that is green.
Do you think I should clear my cookies and make another try at the SSI surveys I've already done today? I doesn't appear that there's any record of my having already done them.