I have upgraded to X1 from Studio 7, also, new interface, Scarlett, focusrite 2i2 USB, it has to do with drivers, got it to run a bit without dropping out with high latency buffer, WDM, Triangular, with 16Bit and not checking the 64bit box.  when I tried to run a second track, dropped out.  So, no workie tonight, I am sure this is a driver issue.  Little perplexed. 

Welcome to the forum.
Did you download and install all the updates and patches for X1? There shouldn't be many with such a late version of the program, but check anyway.
Also download and install any updates and patches for the Scarlett.

seems to have fixed itself - with a little help from the Cakewalk gentleman in Boston.  Needed to go with ASIO, got it to work.  updated the interface and sonar with all updates and we are now in  business!! Thanks