I have tried to see how to manually increase the GDI count, and it seems to be easily reproduced like this (visble in task-manager->details->GDI column): 1. Enable sidebar (F7) 2. Using the mouse - "grab" the right side of  the main uT windows and increase/decrease it's size . 3. Each movement the GDI count increases, and never drops back. 4. Disable sidebar (F7 again) and repeat - this no long happens So, I suspect that some  new item in the sidebar is causing thi