Has anyone had problems using Desaturate>Color to gray as FX?

[mrkid]

Hi! Im having some issues when using the Desaturate>color to gray as an FX. If i note merge and leave it as FX, it dont show accurately the edition. Plus, gimp become unstable, and even it delet some portions of the canvas until i shut it and restart. No problem with other fx, at least im aware. Im on windows 10. I will try to see if this happen in linux.