Some background color to distinguish between categories and topics would help a lot.
On the page where you enter a PM, there’s no indication that you’re entering a PM
I don’t see a way to mark anything as solved. Maybe I’m missing it or maybe I’m not a moderator any more.
I think the solved indicators should be larger and show more green.
Pasting text into a message can be very weird. When pasting text that contains either HTML or BBcode, the forum will “entify” some tags but not others. Specifically, <br> almost always gets turned into <br>, but If I enter the br tags manually, they’re left alone. Worse yet, sometimes the preview panel looks fine, but things turn to crap when I actually post. There’s probably nothing that can be done about these issues, I thought I’d mention them just in case.
The forum keeps asking me if I really want to post a link to Bob’s Guides that I’ve already posted. I’ve got almost 300 blog posts and at least 100 other MODX pages there. I often point people to a page containing the solution to their problem and being constantly asked if I really want to do it can be pretty annoying.
Signatures? Lots of regular forum users had them on the old forums and I think having them there encourages people to contribute. Very rarely, some miscreant or bot would abuse the privilege and get almost instantly banned by me or someone else, so I don’t seen the downside.