Go to below location in adminui, and search for "generatepdf" service.Set "Use Acrobat Image Conversion (Windows Only):" to "true" and restart the server-Wasil

This should help : Adobe LiveCycle ES4 * Increase the JVM heap size-Wasil

I'd suggest applying SP1. If you share a sample document, l can try and check if it works in SP1.-Wasil

Share the application server logs as well, for the invocation.-Wasil

That actually applies to ES4 SP1 .Let's try with other timeout values. You'll have to restart the application server.-Wasil

You can increase the timeout values as mentioned here : http://helpx.adobe.com/livecycle/kb/pdfg-timeout-configuration.html-WasilP.S. : Article is for ES4 but would also be helpful for previous versions.