Black "Loading!" screen when trying to view demos

I’m trying to view a demo I recorded on this RP server (specifically one of the Gmod.biz servers). However, there is nothing but a black screen when I try to view it. I’m guessing this is because of the loading menu, because when I hit escape I can see everything that’s happening behind the menu. Here’s some screenshots to show what the problem is:

The Black Screen:

What I see when I hit escape:

Looks like a bug with the way the RP gamemode’s interface is coded. I don’t think it’s fixable.