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Almost EVERY time I try to reply or even post. WHY??? (I know this is probably not the right section, but I didn't see a bugs section.)
My guess would be that it may have to do with the amount of time you take composing a post. Even before the switch (years before!), the server would discard your post if you took to long to add it [too long might be 6 minutes?].
When this happened you would get an error page with the option to copy your post, and would have to reload the thread and add a new post (and usually paste in the copied old one).