Deleted data that just won't go away

I'm not sure what I'm doing wrong, I wasn't having this problem at first, but now am.

I've imported a midi song, and I leave most of the parts on 'static' cause I want song to  be close to orginal..  

I then add some additional parts, I add an 4 bar riff that consists of 2 different 2 bars riffs from a library I made up.  I decided to 'thin it out' so I cut out bars 2 - 4.  Problem is I still hear the original part.  When I look at take window, it displays only the one bar riff, same when I look at the take window.  When in the take window, i "extract from take' there is the original 4 bars of 2 different riffs..

In desperation I cut container down to  one bar long to get rid of notes at measure 3, when I extended container again.  I had a 4 bar container with the part only playing in measure one, when I play the song however, SFP now thought the instrument riff was one bar long, and kept repeating every bar, even though it show up as one measure of notes, and 3 measures of silence..

After I tried twice, program locked up.

This has really got me stumped...

On quitting and rebooting this problem sometimes going away..  not sure of what i'm doing wrong. or is it a gremlin?

thanx.