Forms just stop working intermittently when using Excel too

I have a random, strange and frustrating problem! I am working in R12.0.4 doing some testing, which means I need to keep referring to an Excel spreadsheet (version 2007), so I frequently switch between Oracle Forms and Excel - sometimes by clicking between and sometimes using Alt-Tab. What happens, intermittently - sometimes frequently and sometimes not - is that when I return to Oracle, the form stops working - I can't tab through the fields, I can't select any buttons, I can't even hit the 'quit' icon in the top right corner. My only way out is to close the J-Initiator window (which in turn closes the forms session) and to then re-start my forms session from the Apps Home Page.
Has anyone else come across this?
Thanks in advance.
Jo

Hello!
Finally I have encountered the issue again (I said it was intermittent)!
Here is a copy of the error message in the java console:
Exception in thread "AWT-EventQueue-2" java.lang.IllegalStateException: cannot open system clipboard
     at sun.awt.windows.WClipboard.openClipboard(Native Method)
     at sun.awt.datatransfer.ClipboardTransferable.<init>(Unknown Source)
     at sun.awt.datatransfer.SunClipboard.getContents(Unknown Source)
     at oracle.forms.ui.delegates.VComponentDelegate.handleOKToPaste(Unknown Source)
     at oracle.forms.ui.delegates.VCommonTextDelegate.getProperty(Unknown Source)
     at oracle.forms.ui.delegates.VTextFieldDelegate.getProperty(Unknown Source)
     at oracle.forms.ui.VTextField.getProperty(Unknown Source)
     at oracle.forms.handler.ComponentItem.focusGained(Unknown Source)
     at oracle.forms.handler.TextComponentItem.focusGained(Unknown Source)
     at oracle.forms.handler.TextFieldItem.focusGained(Unknown Source)
     at java.awt.AWTEventMulticaster.focusGained(Unknown Source)
     at java.awt.Component.processFocusEvent(Unknown Source)
     at oracle.ewt.lwAWT.LWComponent.processFocusEvent(Unknown Source)
     at oracle.ewt.lwAWT.lwText.LWTextComponent.processFocusEvent(Unknown Source)
     at oracle.ewt.lwAWT.lwText.LWTextField.processFocusEvent(Unknown Source)
     at java.awt.Component.processEvent(Unknown Source)
     at java.awt.Container.processEvent(Unknown Source)
     at oracle.ewt.lwAWT.LWComponent.processEventImpl(Unknown Source)
     at oracle.ewt.lwAWT.lwText.LWTextComponent.processEventImpl(Unknown Source)
     at oracle.ewt.lwAWT.lwText.LWTextField.processEventImpl(Unknown Source)
     at oracle.ewt.lwAWT.LWComponent.redispatchEvent(Unknown Source)
     at oracle.ewt.lwAWT.LWComponent.processEvent(Unknown Source)
     at java.awt.Component.dispatchEventImpl(Unknown Source)
     at java.awt.Container.dispatchEventImpl(Unknown Source)
     at java.awt.Component.dispatchEvent(Unknown Source)
     at java.awt.KeyboardFocusManager.redispatchEvent(Unknown Source)
     at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(Unknown Source)
     at java.awt.DefaultKeyboardFocusManager.dispatchEvent(Unknown Source)
     at java.awt.Component.dispatchEventImpl(Unknown Source)
     at java.awt.Container.dispatchEventImpl(Unknown Source)
     at java.awt.Window.dispatchEventImpl(Unknown Source)
     at java.awt.Component.dispatchEvent(Unknown Source)
     at java.awt.EventQueue.dispatchEvent(Unknown Source)
     at java.awt.SequencedEvent.dispatch(Unknown Source)
     at java.awt.EventQueue.dispatchEvent(Unknown Source)
     at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
     at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
     at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
     at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
     at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
     at java.awt.EventDispatchThread.run(Unknown Source)
Hopefully that will be meaningful to one of you. I notice it says something about a clipboard - just in case it matters, I am NOT trying to copy and paste between the applications.
Thanks,
Jo

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