I'm not sure how to approach this problem. I have a computer with Intel graphics running Ubuntu 16.04 and GIMP doesn't update graphically on it unless the GIMP window is moved or minimised and then maximised. So, I mean that any interaction with the GIMP interface, whether it be selecting a tool or drawing on an image, does not update and become graphically apparent unless the GIMP window is changed in some way.
I have not observed this with other programs on this computer and I'm not aware of any graphics problems on this computer otherwise.
What is this problem and how might one approach the task of fixing it?