Problems with new Pro-Tools 12 and Focusrite 6i6

[The_Juan]

Hey you all!

This is my first post here after reading some similar threads and trying the recommendations without luck.

I got Pro-Tools 12 last week and installed it. Now after being done with the configurations and wanting to do some test projects, whenever I hit the space bar, the play icon blinks a couple of times, and nothing happens.

I've tried many of the suggestions in this post: http://duc.avid.com/showthread.php?t=349102
All of them in vain.

I tried:

-unsintalling and installing again, with administrator rights, the drivers of the focusrite (Mixcontrol)
-changing the buffersize
-changing the sample rate
-restarting the computer
-uninstalling and re-installing Protools

Do you guys have any suggestions?
I'm gonna test an M-Box and an RME device this week to see if the problems is from the Focusrite. But that's been my suspicion from the beginning.

Thanks for your help!

Juan