I probably won’t bother to try this because I think it’s unlikely that it fixes whatever is broken in Gimp that prevents me from using it. I use DWM. Gimp simply doesn’t work with that window manager. I won’t bore you with details, but other users of DWM or, possibly, similar WMs know what I mean.

It’s not DWM’s fault. It works fine with programs that support X11 properly. Krita, for example, works perfectly with DWM.