Ashley Nope, all fixed with installing r88. Sorry, I should have thought to try that. Thanks!
In hindsight I did install Minecraft between it stopping working, if that helps, but I guess whatever it was got fixed in r88 for me.
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I'm having the same problem! It only started happening today, but it's completely stopping me doing anything!
Windows 7, concept release 84, pretty sure everything is up to date and don't think I've installed anything between it working and not :(