>>>What property determines the ordinal arrangement of the options in an option group? Ie, when selecting the first option, the value of the container is 1, selecting the second sets the container value to 2, etc.
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>>>I have an option group that is not following the rules, and clicking the second box sets the value of the container to 3, clicking the third box sets the value to 2. I thought it might be the tabindex, but they are set correctly.
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>>What about the Value property of each OptionButton? What are they set to?
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>The first and second have 0, and the third has 1... the third is selected when the form is instantiated.

Is the controlsource the optiongroup bound to initialized with a value of 1? In that case, the third option would be selected. If the value were 0, then I believe the first button with a value of 0 would be initailly selected.