Source settings changing

[Simon N]

I have a project where I have 300 clips. I have altered some of the source settings to suit, but I am finding that certain sequences of clips are changing their settings, notably ISO from default of 320 to 640 which is only noticable on playout at which point I review the individual clips and see the ISO change.

Build 18
CS4 v 4.1
install v1.7