I tend to be impulsive and live on the bleeding edge, so I also tend to go through cr*p like this more often than I should. That said:

I downloaded and installed the QK4 beta (v1) and fired it up. All of my shortcuts showed up well enough, but they wouldn't trigger. Tried adding new ones. Wouldn't trigger. No problem, I'll revert to QK3 until this is ready for primetime (see where this is going?)

The QK4 installer does NOT make a backup of your existing QK sets, nor does it warn you that your existing QK sets will be unusalble after using them in v4.

So, my advice, if you want to tinker: navigate to ~/Library/QuicKeys and make a backup of it. Simply right/ctl-click the QuicKeys folder and choose "Compress QuicKeys" and you'll be good to go.

If the 4beta doesn't ring your bell, you can delete the QuicKeys folder in your library and unarchive the zip file you just made to be back golden with v3.

You've been warned.

Me? Since I had just synced my desktop QuicKeys folder to my Laptop, I hadn't really created anything to lose. Just rsync'd the Desktop to the laptop again and I was back in business. Thanks for asking!