I gave the soft reset a try. Still no luck.
Noticed when I try to play one of the 24 cuts, the thumbnails go dark as it freezes on the "Play from Start".
My refurb'd 3575's SE2 would let me see titles in the bad spot on my HDD (within 1st 3 titles on empty drive), and it would let me play them, then freeze with SE2 while playing. Eventually, the HDD healed itself (isolated bad sectors?) and no problems now.
I'm intrigued by your situation in that it won't SHOW Title #1. Since all title pics are drawn in sequence, I'm wondering if the problem might be in Title #1 instead of #23/24 where the error started to show up? But start with 23/24 first.
The strange thing is the system puts up the thumbnail outlines but doesn't fill in any of the 23/24 titles, so it's lost contact with the User Data (video) where it gets the thumbnail. I think finding the bad-boy title should clear the problem, but knowing which title is bad might be the real problem here... not as straightforward as my SE2.
HOW FULL IS YOUR HDD, AND HAVE YOU DONE A LOT OF EDITING?