After upgrading to Leopard today I discovered most of my scripts no longer work. After reading
this post I worked out that the problem is in the way colours are assigned to objects. So to summarise in Leopard, this code will crash:
[code:1:2fdecb6a83]make new picture box at end with properties {color:"Black"}[/code:1:2fdecb6a83]
To get it to work you need to rewrite it like this:
[code:1:2fdecb6a83]make new picture box at end with properties {color:color spec "Black" of document 1 of application "QuarkXPress"}[/code:1:2fdecb6a83]
Also, the color spec "None" no longer seems to be supported. If you want to set the colour of something to "None" you need to use the following:
[code:1:2fdecb6a83]make new picture box at end with properties {color:null}[/code:1:2fdecb6a83]
This seems to be the case for anything: text, boxes, frames, gaps etc. So, bear this in mind if you decide to upgrade - you could be there for a while!
If I come across anything else I'll post it here. Hope this helps.