I have a USB key encrypted with Truecrypt. I tried to use it tonight (been a few months) and I get the error: An incompatible version of the Truecrypt device driver is currently running. Required version: Truecrypt 5.1a" I have 6.0a installed on my machine. Is 6.0a not backwards compatible? I can't imagine this to be true? Any ideas how to access the USB key? Or do I have to uninstall 6.0a, reinstall 5.1a, access the USB key, remove encryption, uninstall 5.1a, install 6.0a, reencrypt with 6.0a? If so, that just sucks.