Hi Ron,
It's hard to say what's happening with your file sizes. The interactive elements could be the problem... but it all depends on what you are adding or changing in the layout. If the file is increasing with no additions or major changes, you should contact our technical support group because something strange is going on there. I am not aware of any current bugs which would manifest this way. Can you tell me a bit more about what you are doing in the layouts when their size increases signifigantly?
Thanks!
Drew Bartlett (Quark)
Technical Product Management - Desktop