The problem with the What's New is I want to visit individual forums and read everything in that forum that was unread as sometimes I may see a topic I want to revisit again. So while the refresh will work, it's time consuming when you keep have to do it inside the forum itself so the thread unbolds to figure out what you already read and what is really unread. That is why I have noticed that I was spending more time than needed in each forum because I have to keep refreshing manually after I back out of the thread itself. Yes, it could be a caching issue because maybe it has to do with the preloaded settings in the browser for all I know. When there are only a few unread threads, it's less of a problem but if there were like 20 threads that are BOLD, and you basically have to read, back out of thread, refresh and repeat for each thread that is read, it becomes a chore that ends up taking a lot of time for the refreshing manually. So I should say it may not be the forum software because the same problem exists with other forums so it could be there was some change in the code of the browsers where it is not comparing the cache to the contents on each visit. If I had to guess, I would say it is related to this setting in the browser which used to work correctly until sometime recently because it seems to be something recent since I didn't talk about it before if it was that bad so as with anything, in this case, it seems like it's a browser issue and not the site:
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