I tried it in firefox too(the puzzle piece is only with chrome, videos are also always laggy in chrome since a few weeks, so since then I always use firefox for videos, like watching tv-episodes or movies/documentaries online)
I recently updated both flash and divx though(in the last 1-2 weeks)
I think the puzzle piece in chrome is due to the settings, I believe that a while ago chrome was constantly freezing/getting really slow on pages with a lot of flash(mostly ads), so I changed the settings so that it doesn't automatically start flash, but reqyuires me to click it before it starts. the screen with the test was a puzzle piece at first too untill I clicked to activate it(I never changed this setting for firefox)
this laptop is getting a bit weird and slow lately, if I type in a website I also have to wait 5-10 seconds before it starts loading the page, sometimes I have to wait a while before the letters I typed appear in the url-bar