I have been waiting for you to fix a number of bugs in this driver. I have upgraded several times, but non of these bugs have been fixed. This has been going on for some time.
OS: Windows 7 64bit
Screen: Asus PQ321 using DisplayPort, resolution: 3840x2160
I am sorry you are having problems with the driver but let me help you.
Please note that we have released a new driver version 3412. Please uninstall the current driver and download/install the latest one here:
I have tested a DZ87KLT-75K motherboard with the Intel® Core i7-4770K (HD 4600) and I was not able to replicate the bugs you mention.
My best recommendation is to update the graphics driver and update the BIOS in your system provided by the computer manufacture.