Menus without background and user pref have parts missing In blender version 2.69 and 2.70 and 2.70a the menus have no background and I can't find out why.

This is most likely system-problem; not a direct Blender3D issue because this error happened when I updated to Linux Mint 16.

I assume that some library (python?) version causes this error.

I have been searching for two days without any hint regarding this error so a little help/hint is appreciated. 

Image examples:
Check your blender user preferences. Under the Themes tab in the user preferences go to the User Interface settings. Then scroll down to the item that says Menu Back:, check if the Inner: color has any alpha. If that is at 0 then that is your problem.

Also If you scroll all the way down on that same page you will come to a item called Menu shadow: Check if that is above 0, and that the size is above 0px. 

If these two did not help then it is a bug with your system.