This post is better suited for Geek Stuff, but I'll go ahead and answer your question.
In the Member's Help Area, you can clear your cookies. Might also be a good idea to manually clear your cookies through your browser, through Easyclean, Disk Cleanup (comes with MS systems), or very manually going into the Cookies and Temporary Internet Files folders in C:\Windows and removing everything in those folders.
Basically, you need to reset your cookies. Then when you open PipTalk again, go through Member's Area/Help, select change your profile, scroll down the page and click OK, then click the Login button in the upper right corner, and that should reset all your PipTalk cookies so they function properly.