Nicking what Juamei said above & adding a few bits:
Your browser keeps a copy (& record) of pages you visit (called a cache). This forum displays visited (cached) links in orange and unvisited ones (uncached) in red. If you clear (flush) the cache (or something else clears it) on your browser, it makes them all go red.
If you do some kind of disk clean up or manually wipe cookies you may clear your cache in the process. Or (as happened to me the other day) it can just happen for no apparent reason.
The technical term for this mysterious unwanted 'cache-clearing' is BASTARD COMPUTERS!!!!!!!!
love
Moth
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