I logged into the Guardian Genius page an hour ago & the puzzle wouldn't load. It worked fine July 2, & a few days later when I submitted it.
It might be a problem with Adobe Flash Player, which popped up a new update just now. All is well again & the Genius appears.
Over the last month there was a conflict among Firefox, RealPlayer, & Adobe. This resulted in videos not playing, & blank areas which were probably Java applets, even though I had all the latest versions.
The solution was to uninstall all 3, download current versions, & re-install.
Likely problem is that the updates are arriving so often they get out of sync, and they're not being tested properly before release.
I would recommend creating a restore point before each update. Makes it easier to step back in time to where things
DID work.
Control Panel -> System & Maintenance -> Backup & Restore Center -> Create a Restore point.
Hope that helps.