Random problems in swf, I can't figure it out

I’m having some weird issues with a project I’m working on. I’m loading some images and referencing an XML doc to get names and data. So basically I’m attaching a bunch of movieclips and duplicating some etc. I’m seeing two problems that I just cannot figure out.

The first one is: The images I loaded & the corresponding buttons are supposed to disappear/unload when the user clicks on a new section. It works most of the time but sometimes it doesn’t.

the other issue is that lets say we have four buttons (1-4) they each have a corresponding image (also 1-4) so when click button 1 you should see image 1 right? Well that’s true most of the time, but sometimes the more you click around the more of those buttons that don’t work.

Anyway, I hoping one of you flash experts out there could take a few moments and look at my fla to give me some ideas of where my problem might lie.

You can view the swf here and download the fla:
http://projecto3.com/files/flash/menuSys.htm

Please let me know if you can help.

Any thoughts or help is greatly appreciated.
Erik