For what it's worth, I've been reading this topic for a few days after stumbling upon it. At first I did not know what the problem was and neither did my ISP know, nor could they help me. After much tweeking and re-loading software, I was exhausted and drained.
I have the same exact problem with my Windows XP and IE 7 and only on the geocaching website. As soon as I try to navigate or look something up, my puter locks up and I get weird visuals and error messages.
After reading the suggested recommendations, I loaded Google Chrome and tried it. Works fine as far as getting into the site and looking things up.
THERE IS STILL A PROBLEM..... WHEN I ATTEMPT TO FILTER OUT MY FOUND CACHES IN THE SEARCH MODE, IT DOESNT DO THAT, AND RETURNS A FULL LIST OF CACHES I'VE ALREADY DONE, AS WELL AS THE ONES I NEED MIXED IN WITH THE RESULTS PAGE.
VERY ANNOYING TO SAY THE LEAST..
Has anyone resolved the above search issue as yet?