Apple has issued a small supplemental to this week's beta releases of OS X El Capitan. The update fixes an issue encountered with 32-bit apps.
This update fixes an issue that may cause some 32-bit apps to quit unexpectedly.
The update is available through the Mac App Store on machines with the latest El Capitan beta installed. Earlier this week, Apple released both the third developer beta and first public beta version of OS X El Capitan, which is expected to release to the general public later this year.
Thanks to Keith H for the tip!