Q: Soundtrack Pro Error On Startup

Every time I initiate a session in Soundtrack Pro, I receive the following message:

"An Unexpected Problem - NSRangeException
Cannot remove an observer
<AudioFileEnvelopeTrackHeaderView 0x1dd80000>
for the key path "Meter Jack Order" from
<NSUserDefults 0x148b4f0> because it is not
registered as an observer."

Can someone help with this issue?  Thanks!