Dennis' band tours a lot more now and he also is doing Fletchers so he is not there as much.
From what I understand they recently upgraded the speakers to EAW 850's like the 930 has. To be honest, I like the new room, it is much better than the old Black Cat with the sound of a friggin' hallway. They added the damping material that makes it sound better too. The problems are usually the engineers (with the band) as it is not the easy room the 930 is to mix in. There is a good amount of stage/house interaction and so often the feedback is not from the monitors but the house. You rarely if ever get that at the 930 club, only some of the waifish singers (Evenescence comes to mind) or insanely loud sound levels. The Black Cat has more interaction, and you can get the house causing stage problems. Also with those brick walls you have a pretty live room that needs a lot of people in it to deaden the sound to where it works (same can be said on a much smaller scale for Fletchers). I know too that they changed the front of house console from the Soundcraft 800 that I loved (though it was huge) to, I think, a Midas one.
So usually it is the engineer with the band or the band itself that is the problem with the sound at most shows. The house guys usually know the room problems and how to deal with them but when you get some outside person mixing it can be hell as you try to help them and they don't want (or are unable to) take any advice.
Remember too that this is a live show. There will often be problems that crop up and you try to deal with them on the fly but can not always get them rectified. Amps blow, cables go bad, mics get bumped, in other words shit happens. At the Black Cat (unless they have changed) they just have one engineer working, at the 930 it is two so there is someone by the stage in case something goes wrong. Harder to do this at the Black Cat as you still have to try to mix and run on stage to put the kick drum mic back in (for example). Can say, been there, done that, and it is hard.