Design Studio on IDT - Java Class not found in classpath

I have a BOE 4.1 SP6 IDT Universe (udx) with a Sybase IQ 15 connection that works locally and on the BI Launchpad.

I open Design Studio (1.6) and can select the universe as a data source but when I try to preview results etc. I receive a Java Class not found in classpath error.

The sybase classpth is defined in the BOE Data Access folders (sybase.sbo) and all our universes (old/new) work perfectly.

Does Design Studio require it's own classpath definition?

Or what am I missing here ..

Thanks

Mike