Are you in the habit of clearing your cookies and temporary files before you begin doing a survey from a given survey site? Not sure why it's important for surveys, but it seems to help to keep the communication track cleaner between you, the survey provider and FC.
You don't have to clear your cookies after each survey DQ (disqualification), but when you have completed a survey, and you have received the congradulation window, leave that window open for 5-10 minutes until you have received confirmation that the survey has created. (I usually have another tab open to my account page so I can refresh it periodically to see if the credit shows up.
If it hasn't credited in 10 minutes, it make be a break-down in the communications. Suggest you take a screen shot of the congradulations page, paste it to your PAINT program, add some comments (using the pencil) to identify the survey site, the time of date and the amt of expected credit. Then save it as a jpeg picture with an identifng name like FCSCPdate so you can find it easily. (Save it to shared pictures so its easier to locate.) (FCSCP=FusionCashSurveyCongradsPage)
If you haven't receive credit in a couple of days, then send a message to support letting them know you have the jpeg picture (or attach it, if you have that option) to see if FC might have some success in contacting the survey site and getting credit for both of you.