For problems with launching ‘Pro Tools First’ I found that a ‘first time setting’ of the ‘Playback Engine ‘ can give problems.
(This could be because there’s not yet (Dec 02, 2016) an officially version of Pro Tools First for OS X 10.11.6). [check]
There is a solution that works for me.
- Download the latest version of ‘Pro Tools First’ and full install it all over again.
Don’t use any old version.
- After full (re)installation, (You don’t lose (if existing) your projects, which are in the cloud) do a first launch of ‘Pro Tools First’.
It can take a minute. (… be patient …)
- Halfway this first launch of ‘Pro tools First’, the system ask you (in small pop-up window and only the first time launch) to set the ‘Playback Engine’.
- Choose: ‘Build-in Output‘ and ‘Optimize Engine for playback‘. (NOT Protools Aggregate)
After this: With me were the launching problems of ‘Pro Tools First’ for 99% solved …