Facebooker talk - Apr 2008 - url_for + :canvas => false weirdness for non resource controllers

I noticed something strange in my app today. It appears that the  
extra canvas path appended in url_for is back but only for  
controllers that are not resources. Here is an example I have in my  
site:

campaigns is a resource
checkout is not

# With the canvas false flag

(rdb:1) @controller.url_for(:controller => ''campaigns'',
:action =>
''show'', :id => 1,:canvas => false,:only_path => true)
"/campaigns/1"

(rdb:1) @controller.url_for(:controller => ''checkout'',
:action =>
''ipn'',:canvas => false,:only_path => true)
"/pledgie/checkout/ipn"


# With the canvas true flag
(rdb:1) @controller.url_for(:controller => ''campaigns'',
:action =>
''ipn'',:canvas => true,:only_path => true)
"/pledgie/campaign/1"

(rdb:1) @controller.url_for(:controller => ''checkout'',
:action =>
''ipn'',:canvas => true,:only_path => true)
"/pledgie/pledgie/checkout/ipn"

Notice that the non resource controller "checkout" has an extra  
canvas path applied to it.

Anyone know a way around this?

Mark