Due to a change in Kaleidoscope 2, Tower 1.4.14 does not work with the latest beta of Kaleidoscope 2 (Build 99 and up) out of the box. We are working with the fine folks at Tower to address this issue.
If you are running 1.4.14, download this script and follow the included instructions:
Future versions of Tower should work as expected without the need for these steps.