Crashes my (late 2007) iMac

Bought this application to use as an extension to Photos. Unfortunately, within a few minutes of launching my iMac screen gets garbled and only a reboot (or logout/login if I can guess from the garbled menu which item is “logout”) gets me back up and running. Has potential, but a waste of money for my old iMac as of now. Too bad.

SLKspirit about Polarr Photo Editor Pro, v1.3.2