i have seen this before also but i never figured it out. Once it was because i didnt ex/import. and once to a master clip. i just left the project open and finished in 2 days.
but trust me some here probably knows.
as a wildcard when you open the project next time and render ex/import the clip with smooth cam applied. you will loose a teensy weensy bit of clarity but you will have baked that smooth cam effect in.
"""
What you do with what you have, is more important than what you could do, with what you don't have."
> > > Knowledge + Action = Wisdom - J. Corbett 1992 """"