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Hello here is a quote from another user discussing a likely solution for your problem in a unrelated thread.

If this is your issue, the following should work:
  1. Open the subforum you require.
  2. At the bottom of the thread list, in the middle, there is a button "Thread Display Options"
  3. If you click it, a new line will open immediately above it, settings will (among other things) read: "Threads with last post from: Forever"
  4. Just click "Set Options" and the hidden threads should become visible.

This has always cleared up that pesky bug for not seeing very old forum threads.

Please post back here if you need anymore help. Or the best place to direct questions such as yours is to the main Forum Help thread Here