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I used to get this on older versions of JavaFX, but don't recall encountering it recently.
See http://javafx-jira.kenai.com/browse/RT-14404 (REGRESSION: D3D stops rendering after screen lock on Windows) for a related (now fixed) bug.
You could try upgrading to the latest developer preview to see if you still have issues: http://www.oracle.com/technetwork/java/javafx/downloads/devpreview-1429449.html
If you are still having issues you could create a reproducible test case and file it at http://javafx-jira.kenai.com and place link to the jira in this forum post.