I’m pretty sure your issue is not related to the AUR build. All it does is getting the sources from bitbucket and build it on your maschine.
Do you use the release version (1.1 currently) or the latest git build? I just checked on my machine with git build version 1.1_38 installed and it works as expected.
Do you by chance use a custom theme? There was a discussion related to the crop tool in the blackfoxx theme thread: