Developer SQL hangs after each request

I have a strange situation that has just begun. After each query, SQL Developer 3.0.02 hangs just for about 20 seconds and then returns to normal. The time displayed for the completion of the request are correct - it's just the UI freeze. I'm running Vista on a 10R2 database. Everything worked very well since 13/01/11 until last Friday. Running with JDK included.

Any idea what has changed?

This could be related to a problem with the history of SQL. If you have a history of SQL open, it can slow down things radically.

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