Maybe it's security issue. Try to run it as admin for testing.

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>Users just recently began reporting problems with some Excel automation code that used to work:
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>loDocument.styles.add(lcStyle)
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>generates the error: OLE IDispatch exception code 0 from Microsoft Excel: Unable to get the Add property of the Styles class..
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>This is not a commonly used feature of the app, so the problem may have existed for awhile. I've tested and found the problem in Excel 2007 and 2010. Any help would be appreciated.
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>TIA