Game constantly minimizing and not resuming

[Taishu]

The game keeps constantly minimizing after a couple of minutes, and can't resume playing. The game keeps going on, i retain the in-game cursor on the desktop, but the game does not respong. Sounds are still coming from the game, but not rendering.

• Validated game files with steam
• Removed all Steam Workshop items
• Reduced graphics settings
• Searched the forums for the last couple of weeks posts

...but nothing that matches my symptoms. I have skipped a couple of months playing, but got excited by the news of the DLC.

Here is my output_log.txt: http://pastebin.com/PatjRiuV
Here is my dxdiag: http://pastebin.com/CmfJzx6U

If you know anything, please help! I want to build megapolises!
Thanks!

 

[Taishu]

Update: After trying the "-force-d3d9" launch options, the problem seems to be solved. Still its not very nice to force users to use slightly oldie drivers without notice. Especially because it has caused no problems upon game launch...