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Message: [QUOTE="JohnH, post: 100425, member: 5139"] So basically you have this code: [code]Interface ISettings End Interface Class DSettings : Implements ISettings End Class [/code] and when you run this code you claim stop is B: [code]Dim x As ISettings = New DSettings If TypeOf x Is DSettings Then Stop 'A Else Stop 'B End If [/code] When compiled this code will stop at A as expected (you can paste this code into your project and run it as posted), so if you are getting different result your code can't be compiled. One reason for this can be that the generated temp files VS puts in Obj folder has corrupted and that the compiled output in Bin folder is left unchanged. I saw this happen last time in VS 2003 some years ago, and the remedy was to exit VS and delete the Obj and Bin folders, when they were generated again the compile process started working again. [/QUOTE]