If you have a rooted Android phone and have been hitting the ROMs, you might have noticed a problem with Android 4.3. Google has changed how Android 4.3 handles superuser (root) permissions. I noticed this when the SuperSU app no longer worked and I was unable to grant root permission to other apps (Titanium Backup, BusyBox, et cetera).
Updating Chainfire's SuperSU app doesn't work and installing either Chain's or Koush's Superuser apps didn't work either (this was before RTFM and realizing it was Google's fault). The solution was surprisingly simple.
If you have been using SuperSU, which I'll assume you are because most ROMs/Recoveries install it, this is a simple fix. XDA lists the features and has the download links. My suggestion is to skip the Google Play download and go straight to Chainfire. Download the zip and flash it from your recovery (CWM or TWRP).