[Tumbleweed] Graphic and freeze

Couple days ago I switched from 13.1 to Tumbleweed (I prefer rolling release then normal versions). Everything is ok but no two things. First is something with my graphics (I have bumblebee but, I turn off second card, and I am using only intel HD), sometimes on chromium when I ope new tab, or there is a animation I see smal little black squares. If I need to be concerned ?

00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor Graphics Controller (rev 09)
sysek@opensuse:~% uname -a
Linux opensuse.site 3.16.1-45.g8fc81d3-desktop #1 SMP PREEMPT Thu Aug 21 15:46:35 UTC 2014 (8fc81d3) x86_64 x86_64 x86_64 GNU/Linux

Second thing is my system just froze. Two times, and these two times was with chromium. I suppose the problem is with the chromium (or maybe not), but I don’t want change the browser to other, mayby only to chrome.

Cheers.