Eclipse Bug: Occurence PartRenderingEngine's limbo

Sometimes the Window: "PartRenderingEngine's limbo" appears as a overlay in your Eclipse IDE and you can't close it ?

The only fix I found is to close all open eclipse windows, which are detached from the original eclipse window. What means, just close all windows except Eclipse.

The bugged window looks like: Buggy-Window

Hope it helps you too like me.