I have a Core2Duo iMac running OS 10.5.8 and Java prefs is set with SE 6 64 bit above the JSE 5 versions

If you do java -version from terminal it returns:

java version "1.6.0_20"

Java SE Runtime Environment (build 1.6.0_20-b02-279-9M3165)

Java HotSpot 64-Bit Server VM (build 16.3-b01-279, mixed mode)

If you do System.getProperty("java.runtime.version") from Scriptmaster it returns

1.5.0_24-b02-357-9M3165

If you turn off the JSE5 in prefs then SM complains on load that it needs Java 1.4 or later to work.

On the MacBook Pro with 10.6.4 and only Java 6 there is no complaint

Can you shed some light on what is causing this and if there is a way to fix it??

I am trying to trouble shoot a function I have written that appears to only run on Java 6, but need it to run on the imacs if possible without upgrading to Snow Leopard....

Go to javatester.org in a web viewer from filemaker and see what version is loading on there. FileMaker may still be using Java 1.5. I'm not sure how to change the version filemaker is using, but this may help you make sure of which version the application is loading.