I am receiving 'null' from my cfajaxproxy calls, what could be the cause?

I am using cfajaxproxy and receiving a 'null' response from my ajax calls. I had this working before so let me explain what i've done which has started to cause this.

I have an app (simplified for the purporses of this question):

/wwwroot/app1
/wwwroot/app1/cfc
/wwwroot/app1/cfc/proxy.cfc
/wwwroot/app1/cfmfiles
/wwwroot/app1/cfmfiles/mainpage.cfm

The mainpage.cfm declares:

<CFAJAXPROXY cfc="app1.cfc.Proxy" jsclassname="admintools">

This has been working fine. Now the issue has come about because i've wanted to seperate the app into 2, since it's evolved into 2 distinct applications, and the proxy.cfc should reside in the new app. So now i have a new app:

/wwwroot/app2
/wwwroot/app2/cfc (with the cfcs relating to this app moved here)
/wwwroot/app2/cfc/proxy.cfc (moved from the old app)
/wwwroot/app2/cfmfiles (with the cfms moved here relating to this app)
/wwwroot/app2/cfmfiles/mainpage.cfm (have moved this file which calls the proxy.cfc)

So now the main page is called via:

http://localhost/app2/cfmfiles/mainpage.cfm
and <CFAJAXPROXY cfc="app2.cfc.Proxy" jsclassname="admintools">
..
rather than:

http://localhost/app1/cfmfiles/mainpage.cfm
<CFAJAXPROXY cfc="app1.cfc.Proxy" jsclassname="admintools">

However, i am now receiving a 'null' response whenever invoking any of the proxy methods. What environmental setting could have caused this? If i have the cfajaxproxy point to the the cfc directory in app1 then it works, but it then uses the application.cfm within app1 when calling the cfcs. For the new app i'm using an application.cfc. I am using an IIS web server. Can any one please make any suggestions as to the possible cause of this? Please suggest anything however obvious since i'm really stuck on this one! thanks :)
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paddycobbettAsked:
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paddycobbettAuthor Commented:
Ok, i've found the cause. I replaced application.CFC with an equivalent application.CFM. They are however equivalent. Is application.cfc not compatible with cfajaxproxy? Does the onRequestStart() function get called on each ajax request, could something there be causing problems?? Can anyone claim to have used cfajaxyproxy along with the onRequestStart() function of application.cfc?
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