Some of the modules seem to break the ability to change your party members around, which is kind of a gamebreaker. For now I've removed everything but the image cache and imageload ones as they seem to behave and make a huge difference on the loading times.
Viewing post in Old: Conquest Tweaks
No errors in the log, I just get a red 'no' sign when trying to move people around if all the modules are installed. I've tried removing the modules, kicking everyone out of the party, and then putting all the modules back in but it immediately breaks again. It was working fine at the start of a new game, but at some point around the Millford questline it broke. Oh well, I'll just live without it.
Unfortunately I already blew away the saves because removing the modules and trying to continue obviously led to other things breaking. The bug didn't occur with just eml, like I said I tried running with just the loading speed modules of your mod installed and that particular problem fixed itself. The only other mod I'm using is the faster battle animations mod. I'll try another run with everything installed and see if it happens again.
I've managed to make a save with the same issue - when loading certain modules (haven't tested all of them myself, but from the minimal testing I did it seems like at least image_cache and threaded_imageload are fine and at least slu is broken) you are unable to remove or add people to your battle party. I can link the save either here or discord if you'd like, along with any other info that might be helpful.