This one has been bothering me for a while. I was able to see an underlying ORA- error that instigated the problem yesterday, but did not write it down (a parsing error like not all variables bound - when the SQL had no variables). One way to get rid of it for a while seems to be re-creating / pointing to the explain plan table - or just altering the SQL and trying again. Having to click away from the Messages tab to the Explain Plan tab gets to be a pain when performing some manual iterative tuning.
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