[Ian Bailey] "You can assign keywords in two different ways, by selecting a clip or part of a clip and then bringing up the Keyword Editor or by creating a Keyword Collection folder in the Event and dragging clips into it. It sounds like you've done both, which probably messed things up."
Actually, that's not what the OP said. He created a FOLDER, not another keyword collection. It's perfectly fine to create a folder in the event, and then consolidate collections into that folder. There is something else going on with his project.
To the OP: How many master clips were affected? Was this just one long clip that you segmented with collections? What codec was the source footage? Do you have transcoding to ProRes on?
It sounds like FCPX got confused about the TC of the selections you created. Are the durations the same?
Andy
http://www.timesavertutorials.com 
