DataGrid, Progress Bar, Button Image Problems in Simulator

[timvos]

I'm puzzled as to why three features that work in my LiveCode app do not work correctly in the Simulator:
1) In a DataGrid on one card I'm not able to sort, edit, or adjust column widths.
These features are all functional in the Run mode of the app.
2) A progress bar set to advance during a lengthy script never appears on the screen,
although it works properly in Run mode.
3) A script that puts a new image on a button located on another card makes the face of the button go blank.
In Run mode the new image is displayed.

Is it possible these features will work on an actual device, but not in the Simulator? (I'm still awaiting approval as an Apple developer, so I can't yet try a device myself.) I have tested these options on Simulators for both the iPhone and the iPad using various versions, but none of them work correctly like they do in Run mode. Any suggestions would be appreciated.