Hi,
This may be a dual monitor thing, but when click on the Steam window it is as if I am trying to drag the window around (i.e. mouse button held). Steam windows also reposition themselves when this happens, so they float around, not under the cursor but elsewhere!
I am using nvidia drivers 290.10, running on a laptop, outputting the display to two external monitors, so the internal display isn't being used. The graphics chipset is an NVS 3100M.
There seem to be a multitude of slowdowns with this machine and compositing window managers, so I am using XFCE. Steam idles at around 17% CPU usage on this Core i5 M520 @ 2.40GHz machine.
I hear that because I have dynamic twinview enabled the nvidia drivers misreport the refresh rate of the monitors to the system, so while the monitors run at 60Hz, the drivers claim 50Hz. This has caused some issues with compositing window managers running slowly, but forcing gnome 3 to run at 60Hz internally didn't solve all performance problems, so it would appear there are other problems as well.
I can run bit.trip runner (non-steam) with no slowdown, but I haven't pushed this machine graphically yet.
Any thoughts? I haven't found another thread on the subject of sticky windows, but maybe my search foo is not good today.