Here is a list of tips from another topic
http://www.fusioncash.net/forum.php?topic=11746.msg134662#msg134662Tips for Offer Crediting
1. Use Internet Explorer or Firefox to complete offers.
2. Do not use Proxy servers that recycle your IP addresses. This will make it appear that you have multiple accounts.
3. Don’t allow another member to log in at your home. Don’t log in at work or other public places that other members could possibly log in at.
4. Set your computer to accept all cookies.
5. Turn off your Pop-up blocker and any unnecessary programs.
6. Use a valid e-mail address and valid information.
7. Do not use the "dot trick". Rotating your email address is a good idea however the dot trick is considered by advertisers to be a defrauding attempt. (example: your.name@gmail.com)
8. Always clear your cookies before starting an offer. (CCleaner is a reccomended freeware system optimization, privacy and cleaning tool. It removes unused files from your system - allowing Windows to run faster and freeing up valuable hard disk space. It also cleans traces of your online activities such as your Internet history.)
9. Do not use an internet accelerator.
10. Do not do the same offers that you have completed on other sites.
11. Do not use Roboform to automatically fill in your information. Most offers have a timer.
12. Be sure to complete the all the requirements for each offer.
13. Leave your browser window open for 4 to 5 minutes after you’ve completed an offer.
14. Check your e-mail account after completing an offer. You must click on the confirmation link to receive credit.
15. Don’t do too many offers at one time. It may cause problems with them crediting.
16. Allow all pages to fully load before closing them.
17. On freebie offers always make sure you get to the final offers page and click on some of the offers! This is extremely important to do!
(thanks cuppycake)