When using the --exportToEPS option in the GUI, the EPS is written to stdout. The intention is that the user can redirect the output to a file. However, the SwixML library writes a startup message to stdout, which is redirected together with the EPS. Therefore, the --exportToEPS feature is broken in 4.0.2.
Fixed on the 4.0 branch from rev. 2666.
Fixed on the trunk from rev. 2679.