Had the same problem this morning and had to revert to SEU . 
 My user action was 
CPYSRCF FROMFILE(&L/&F) TOFILE(KCHEALTH/QRPGSRC) FROMMBR(&N)
 
Pretty simple ones it seems to me.
 
Dave B
Buck <kc2hiz@xxxxxxxxx> 06/25/08 12:39 PM >>>
Running this user action (which worked at 7.0.0.4):
CVTRPGSRC FROMFILE(&L/&F) FROMMBR(&N) TOFILE(&L/QRPGLESRC) TOMBR(&N) 
LOGFILE(*NONE)
I get:
RSEG1003U An unexpected exception has occurred
java.lang.NullPointerException
java.lang.NullPointerException
    at 
com.ibm.etools.systems.core.ui.uda.SystemUDActionSubsystem.doCommandSubstitutions(Unknown 
Source)
    at 
com.ibm.etools.systems.core.ui.uda.SystemUDActionSubsystem.run(Unknown 
Source)
    at com.ibm.etools.systems.core.ui.uda.SystemUDAsBaseAction.run(Unknown 
Source)
    at org.eclipse.jface.action.Action.runWithEvent(Unknown Source)
    at 
org.eclipse.jface.action.ActionContributionItem.handleWidgetSelection(Unknown 
Source)
    at org.eclipse.jface.action.ActionContributionItem.access$2(Unknown Source)
    at 
org.eclipse.jface.action.ActionContributionItem$5.handleEvent(Unknown 
Source)
    at org.eclipse.swt.widgets.EventTable.sendEvent(Unknown Source)
    at org.eclipse.swt.widgets.Widget.sendEvent(Unknown Source)
    at org.eclipse.swt.widgets.Display.runDeferredEvents(Unknown Source)
    at org.eclipse.swt.widgets.Display.readAndDispatch(Unknown Source)
    at org.eclipse.ui.internal.Workbench.runEventLoop(Unknown Source)
    at org.eclipse.ui.internal.Workbench.runUI(Unknown Source)
    at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Unknown Source)
    at org.eclipse.ui.PlatformUI.createAndRunWorkbench(Unknown Source)
    at org.eclipse.ui.internal.ide.IDEApplication.run(Unknown Source)
    at org.eclipse.core.internal.runtime.PlatformActivator$1.run(Unknown 
Source)
    at 
org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(Unknown 
Source)
    at 
org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(Unknown 
Source)
    at org.eclipse.core.runtime.adaptor.EclipseStarter.run(Unknown Source)
    at org.eclipse.core.runtime.adaptor.EclipseStarter.run(Unknown Source)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.eclipse.core.launcher.Main.invokeFramework(Unknown Source)
    at org.eclipse.core.launcher.Main.basicRun(Unknown Source)
    at org.eclipse.core.launcher.Main.run(Unknown Source)
    at org.eclipse.core.launcher.Main.main(Unknown Source)
I get identical errors no matter what command I use, whether from the .4 
set of from a new user action I created with .6.
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