My Specs:
Mac OSX Yosemite 10.10.4
MacBook Pro (Retina, 15-inch, Late 2013)
Processor 2.6 GHz Quad Intel Core i7
Memory 16 GB 1600MHz DDR3
Details to recreate issue:
Open Mediabay and define locations to “VST Sound” then filter to only show midi loops then select “keyboards” and "E-Piano in the attributes. Import the first one called “ClassHouse - Chorus B - E_Piano.midiloop”. Then right click and go to chord track in the menu and select “Create Chord Symbols” and you will see that not all chords are created. Same thing applies to diffierent midi loops so please try out other loops. Stock midi loops, midi loops I record and imported midi loops all have the same issue.