Menu fonts look blurry/fuzzy in 5.1

Probably related to my other question Menu and content not shown in 5.1

Menus are not shown when i open the application. But when i click on the empty spot the drop down menus appear and i can go through them (File, Edit, Help, etc.). But i noticed that fonts are a bit blurry/fuzzy in the menus. It was ok with 5.0 version. This also looks fine when i install 5.1 in a virtual machine. Again, can be related to video drivers/vc++ libraries.

Win7 Pro 64-bit

Have solved it with a workaround (disabling OpenGL). Check the linked question for more information.