There were so many places things needed to be changed it's not even possible to make the changes in 6.5.5 without rewriting a huge chunk of the code. What's strange is there are some server/setups this works flawlessly on. I talk with some people that never have a problem or complaint about it, while others have all sorts of problems. And then sometimes it's down to invididual users. Some people can visit and post all of the time without any problems and some people have all sorts of issues on the very same site. This is the reason I had to junk everything related to new post tracking and rewrite it all is I couldn't isolate it down to a single problem.
