With the upgrade to Mavericks, my Boinx is now saying I’m SE. I paid $500 for the license. What gives???

Thats really strange. Are you using the download version with a license key or the AppStore version?

download with license

should I reinstall?

We had some problems with the zip binary of the download version. Now they are sorted out. Please download the app manually and try again! Sorry for the inconvenience!