Unable to instantive live instance for panelBinding; using placeholder inst

I have an ADF panel with an edit form on it.
If I start JDev, it shows the following message in a "UI" log window:
"Unable to instantive live instance for panelBinding; using placeholder instead."
and there is no UI control displayed on the panel.
However a run panel action fixes the problem.
It is not a major issue.

hi
I also (sometimes) get the "Unable to instantiate live instance for panelBinding; using placeholder object instead." message in the UI Log panel.
Is there documentation about this message, when I occurs? (I haven't been able to consistently reproduce this.)
If I run JDeveloper (10.1.3.1.0.3984) using "jdev.exe" I don't see related messages on the console.
We also have an issue with component bindings getting created in a new SomePanelPageDef.xml file while one existed and we end up with both SomePanelUIModel and SomePanelPageDef as pageDefinitionUsages in DataBindings.cpx and of course the panel doesn't work. I think these issues could be related.
Any suggestions or documentation? (And yes "the compiled class is present in the classpath".)
many thanks
Jan Vervecken

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