Hi there,
After installing this version (31.0.1700.0) Iron.exe started to give problems when browsing certain webpages. By monitoring processes couldn't find the cause: it might be GPU, a tab, or iron.exe itself. In short, it was completely unstable. And surprisingly this didn't happen in last version of evil G Chrome... what the... :-S
So I had to downgrade to version 30, and found the same issue. By going to version 29 everything became normal again, except for all passwords lost in manager (luckily i made a backup) and probably something else I haven't found yet. So my advice to anyone with the same symptons... go back to Iron 29. In Sourceforce there's a mirror with all previous versions.
Computer specs:
Windows 7 SP1, AMD Athlon 64+, 4GB, Radeon X-550... all systems clear
Happy downgrading! ^_^