Some people, unfortunately, find that it isn't worth it on their computers. But that is definitely the exception, not the rule. There are a couple of threads about the best ways to get OTX to credit (I think in the technical forum). One thing that seems to help is to clear your cookies first and then leave the OTX page open after you complete the survey.

I'll admit that I never clear cookies. And I use both IE and Firefox interchangeably. And I don't think that I have ever taken one and had it not credit. (maybe one??) So I don't think that all tips work for all people. But if you have them not credit for you frequently, there is definitely a setting on your computer that isn't working or something that is blocking the cookies. We have about 10-15% credit rates on a lot of freebie offers, but it's more like 95-98% of the time that people complete OTX and Greenfield that they credit properly.