Thor pointed out to me that our build script would not see changes to javafx-font-native/src/MacFontFinder.m
We needed to perform a clean build everytime that file was changed.

I tracked the problem down to javafx-font/build.xml check-native
Here is the one file fix:
--- a/javafx-font/build.xml Wed May 09 12:03:13 2012 -0700
+++ b/javafx-font/build.xml Wed May 09 13:43:15 2012 -0700
@@ -33,7 +33,7 @@
 
   <target name="check-native">
     <uptodate property="native.uptodate" targetfile="${native.dist.dir}/${native.lib.file}" >
- <srcfiles dir= "${cpp.dir}/src" includes="*.c *.cpp"/>
+ <srcfiles dir= "${cpp.dir}/src" includes="*.c *.cpp *.m"/>
     </uptodate>
   </target>
 
Felipes-MacBook-Pro

I also checked (quickly) for other components that could have the same problem, here the list:

decora-d3d/build.xml: <target name="check-native">
(check each files individually)

decora-sse/build.xml: <target name="check-native">
(only checks for .cc, should check for .h)

glass/glass-mat-lib-macosx/build.xml: <target name="check-native" depends="init">
(checks for .m and .h - good)

javafx-iio/build.xml: <target name="check-native">
(checks for .c and .h - good)

prism-d3d/build.xml: <target name="check-native">
(checks for .cc and .h - good)

prism-es2/build.xml: <target name="check-native">
(checks for .c .m .h - good)

prism-es2n/build.xml: <target name="check-native">
(check for .c .m, should check for .m)

prism-sw/build.xml: <target name="check-native">
(checks for .c .h .inl)

It seems that decore-sse script is missing decora-sse-native/SSEUtils.h
and prism-es2n script is missing prism-es2n-native/src/macosx/MacOSXWindowSystemInterface.m