I am running Version 34.0.1847.131 of chrome and am having issues (well a co-worker is having issues with certain sites and I was able to reproduce them) with grey boxes showing up on some sites as if a certain site element couldn't be loaded. I have not been able to get rid of them at this point, any suggestions?
The only add on I currently have is IE Tab.
What I can tell from my experience is that flash player (or something like it) isn't working on these specific sites. Try updating flash player and see if anything happends.
EDIT 1: I just remembered that chrome has disabled flash player. Try enabling it in the NPAPI-settings. (details here: https://support.google.com/chrome/answer/6213033)