I have been using my VX20 console for a while now with a 13" macbook pro since I purchased the software and console and it has been awesome.
I just recently purchased a new computer (Macbook Pro 15" w/OS X El Captain Vers. 10.11.3) and it has no problem hosting the Clarity Software (Vers.2.3.3), it even registers that there is a VX20 connected and allows me to add and remove cues. The VX20 DMX-A port has solid green (meaning it is connected), however the console does not actually show any cue lists. All that shows up is the stck standard "LSC CLARITY Version 1.14".
Obviously this is quite frustrating as i can't actually use the console and I'm quite stuck as to what the issue actually is. It still works fine with the 13" macbook pro running OS X Mavericks Ver. 10.9.5.
Attached are some photos to assist. If anyone knows anything it would be much appreciated.