Same issue here using IE.
I've done everything; cleared cache, deleted history, uninstalled & reinstalled plugins, uninstalled & re-installed both Origin & BF3, added Battlelog as a trusted site, updated/uninstalled/reinstalled Java.
The most frustrating thing? My wife's computer had no issues with the new plugin and was able to install it and play straight away (we have identical computers/OS/software).
Seems that alot of people are having issues with this update...
