Sorry, forgot additional infos:

On 12.07.2011 21:56, Rony G. Flatscher wrote:
While debugging a library, I stumbled about the following behaviour: after replacing
the resulting library would not behave the same. Undoing the change makes it work again.

Not being sure what the cause really is, I just would like to be sure that invoking IsString(obj) with the same object as IsOfType(obj,"STRING") should in both cases return identical results. Or is there some difference in howe these two APIs carry out their functionality, such that it is possible that they might return different results supplying the same object?