Thread titles seem to be limited to 45 characters. That's OK. There has to be some kind of limit, and 45 characters should be plenty, assuming people use some discretion.

However, some people seem unaware of this limit, and they try to post titles that exceed it, resulting in truncation. Is there any way you could warn them? Instead of accepting whatever title someone proposes and then truncating it, maybe you could reject it and give the poster a chance to revise it.

If you can't reject long thread titles, the next best thing would be to make the new thread title appear in a fixed-width font such as Courier, with some kind of visible mark at the 45-character point. (It would only have to be fixed-width on the new thread page, not on any other page.)

If you CAN reject long thread titles, while you're at it, maybe you could reject duplicate thread titles, too. (Duplicate thread titles are usually the result of someone inadvertently posting the same new thread twice.)