Try this an see if it helps. Go into your Flash Publish Settings and select the option to Permit Debugging. That might help by identifying the line number where the error is being encountered.
Beyond that, the errors as you show them make it sound like there is some form of syntax/coding error where object classes are not being designated properly such that they are coming across as variables instead.
Thanks ... did that and the error went away, so now I'm even more confused about what caused it! At least it's working now.
I don't define or use ComponentShim or UILoader in any of my script, so it must be internal to the Flash components (I'm using the checkbox, ComboBox and TileList). Maybe Flash wasn't automatically adding one of the required classes. [shrug]
You're welcome... I'd be even more confused as well, but if the problem went away, hopefully it stays that way.