today I tried to start UWC in case of a testing transition and it just starts in a pure grey box without drawing some context on it, I had similiar issues on another java tool and fixed it with starting the tool with an AWT_TOOLKIT=<TOOLKITNAME> parameter before running that tool, so I guess it might be something similiar here too and would like what I can try to get UWC started.
Any help would be welcome.