For me, I just hit the home button and it asked me which launcher I wanted to use and I selected trebuchet.
I couldn't get my phone to do anything other than submit a bug report or reboot. I ended up reflashing the ROM and immediately canceled the update for Apex Launcher. Sucks that I had to set everything back up again but I'm back in business.
My phone got an Apex Launcher update this morning and now I can't use my phone with this ROM. I've had to boot back to my other ROM. Any suggestions?
This happened to me as well. My only option was to email myself an older version of the Apex Launcher APK file. Since Gmail still works just fine, it pops up in the notification bar and allows me to download and run the APK file. Once that's run, you can go to the Play Store and download the latest Apex Launcher, which works fine.