Today I found a thread that interested me on What's New.
I moved away to get a URL of another thread so as to reply to it helpfully.
After that I couldn't find the original thread again. Went bonkers searching for it because it had a something on it I wanted to use.
Because I'd read it it now didn't show up on What's New.
Eventually found it after a LOT of effort.
I did search after search of the forums but as I'd seen it on What's New I assumed it would show up on recent pages so I only scanned the first 3 pages of searches. Turned out it was an older thread so it didn't show up on the searches.