BuildTrigger in Flexible Publish doesn't work since Jenkins 1.501

Config set to "Build other projects" (trigger only if build is stable)

Log shows:

Strings match run condition: string 1=[ref-updated], string 2=[ref-updated]
Strings match run condition: string 1=[master], string 2=[master]
Run condition [And] enabling perform for step [Build other projects]

It's the last step and build is stable, but the other job is NOT triggered. The other job takes one optional argument, but it's never triggered by this plugin.