In some loops, I get a distinct click or pop either at the beginning or end of the loop.  It always occurs in the same location -- the beginning or end, never in the middle.  Of all the loops in my system, about 10% are affected, regardless of whether they are .ogg or .wav files. 

Strangely, it often occurs on only one loop and not of the others in the same family.  For example it occurs at the beginning of Ambient v9/Strings/Cello 1.HDP, but not at all with Cello 4.HDP in the same family. 

I'm using the latest update of Music Maker MX Download 18 running on a high-end Windows 7 machine.

Any ideas?