Today I had the Fitting window open, then opened a smaller window that was in front of the Fitting window. I could not click inside this smaller window to enter text, the click instead opened ship info from the Fitting window. I had to move the smaller window outside Fitting to be able to use it.
After I closed these 2 windows, I now have a deadzone around the area where this happened, seems to be slightly lower on screen. No mouseclicks are detected in this area in new windows or on objects (like my ship) this includes right clicks. Outside this deadzone, things seems to work normal.
Dead zone is limited to client, I can open another client, find the deadzone, tab over without moving mouse and click in that area in the new client.