I have noticed to different issues with [START]ing a master.
1.) If the master content is a channel and the Master button is set to be START, the channel runs to full in a bump regardless of the Master Page time. If a time is put on the master, it will run up and down in the time set for the master.
2.) If a palette is loaded to a master, [START] & [Master Select] will run the fader up but not apply the palette to selected fixtures. Running up the fader manually has the expected result.
This is all with v8 release on a Cobalt 20.
Take care,
John