[hotel17]

Thx for reply.

I don't use an external drive. My boot drive (OS X) and my audio drive are both the same. This is because I'm recording one single mono track (no inserts). If all other DAW can handle this,.... Pro Tools can't?
I only use a external drive whenever I'm recording more then 4 tracks.
On my MacBook Air I have an SSD drive.

All my plugins are working.

I don't understand why I can't record a single mono track. Error message pops up after few seconds.

Help on this is much appreciated, as for Pro Tools is useless to me.