Hello,
Most likely related to Yosemite, it needs special handling - from the thread above:
we just updated Mac AppStore with build 2.0.90 that (among other things) has Yosemite related fixes, once it gets approved by Apple you can get it from there
Or you can get it from us directly at
http://www.mthbuilt.com/download.php - we will post it in few days
Drop us a line at
info@mthbuilt.com if you need it right away, we will send you a private build
Thanks