Strange light blue shapes, EP4

[meanalessia]

Hi everyone. I'm having a problem with Pets EP. In build and buy mode I see pieces of grid showing where they shouldn't (across the walls), and strange light blue shapes appear, also in life mode. Things sometimes disappear, the tops of the counters disappear, strange little 3D shapes appear in fridges etc. And, in life mode, sometimes i can see things through a wall, for example from the kitchen I saw the little girl moving outside, across the walls! When these things happen, just moving the mouse makes it all work again, or it makes happen another of the strange things that I wrote.:smt120
I made sure to remove my hacks, but it had this problem again. Then i tried to disable all of my custom content, and it didn't help. I also uninstalled and then installed again the EP but nothing...
What is this? The first times I played with Pets I didn't have any problem!
Please help me!
Thanks in advance.:angel::snorting::snorting:

[MissDoh]

I would try at first to update your video drivers.

[meanalessia]

I've updated my video drivers, now everything's ok. Thanks.

[MissDoh]

Welcome, glad for you it only took a driver update to fix it.