Blender 2.79 interface freeze I've experienced a pretty unusual error. An issue I cannot explain enough to find it on Google. The error goes like this. When Blender starts, everything looks fine, the console shows up for a moment, and then the main window appears. But, while normally the gray background quickly changes to normal Blender interface, in my case, it stays gray. Now, it's getting weirder. When I move the window or resize it, window updates. When I click on something inside the interface nothing happens unless I move/resize the window which triggers the update of the interface.
I have no idea what is happening.

In case if needed I attach my spec-sheet:
Dell Inspiron Inspiron 5558; Intel Core i3-5005U 2GHz; Intel HD Graphics 5500;
Alright, I've worked out a solution by accident. It is a pretty unusual situation because actually, I have no idea why that solution was valid.

Solution: Switch from high contrast theme to a normal one in Windows.

For some reason, the Blender interface was unresponsive while Windows is in high contrast mode. When changed to a normal theme, everything is working just fine.