isInstanceOf() behavior in CF 9

Another suggestion, related to Adam's: did you write <cfcomponent extend="Member"> by mistake instead of <cfcomponent extends="Member">?

You don't really provide us with a complete reproduction case here, so I've had to guess at some of your code, but it works fine (and as you'd expect/want it to) for me.

Can you post a proper / complete reproduction case so I can see what you're doing?

Here's my repro case, by way of exmaple of what you should be posting:

<!--- User.cfc --->

<cfcomponent>
</cfcomponent>

<!--- Member.cfc --->

<cfcomponent extends="User">
</cfcomponent>

<!--- Admin.cfc --->

<cfcomponent extends="Member">
</cfcomponent>

<!--- testInheritance.cfm --->

<cfset o = createObject("component", "Admin")>
<cfif isInstanceOf(o, "Admin")>
    <cfoutput>It's an Admin<br /></cfoutput>
</cfif>
<cfif isInstanceOf(o, "Member")>
    <cfoutput>It's a Member<br /></cfoutput>
</cfif>
<cfif isInstanceOf(o, "User")>
    <cfoutput>It's a User<br /></cfoutput>
</cfif>

Output:

It's an Admin
It's a Member
It's a User

When working through this sort of problem, one should always pare the situation down to this sort of level so as to remoev as many contributing factors as possible.  Then add potential contributing factors back in until one identifies the problem.

--

Adam