Why tables do not show on the tree?

Why do, though not regularly but often enough, tables branch is missing on newly opened connection? 2nd version of SQL Developer never had that “feature”. Sometimes close/start helps, sometimes not. Often closing, launching and closing SQL Developer 2, and restarting 3rd may help too.
All databases I connect to are either 10.2.0.3+ or 11.2.0.2 EE, or 10XE.
The problem, if appeared, is there for any connection in list, so it is rather a general thing not depending on the other end.
I even haven't been able to figure out on what conditions that happens, it seems to be random - although if it have happened once then there's high enough probability it'd be still here on next launch - unless 2nd version is started and closed before 3rd one's restart, however even this not always helps.
Oracle SQL Developer 3.0.04
Version 3.0.04
Build MAIN-04.34
Copyright © 2005, 2011 Oracle. All Rights Reserved.
IDE Version: 11.1.1.4.37.59.31
Product ID: oracle.sqldeveloper
Product Version: 11.1.2.04.34
Version
Component     Version
=========     =======
CVS Version     Internal to Oracle SQL Developer (client-only)
Java(TM) Platform     1.6.0_11
Oracle IDE     3.0.04.34
Versioning Support     3.0.04.34
TIA

Thanks for all who responded.
I check for updates frequently and apply as soon as they are offered. That does not help, however. Disappearance of tales on the object class selection tree happens now and then, no matter what I try to do.
It's Windows (XP) where there's the problem. I haven't noticed that on Linux. However, I have to use it on Windows because of several reasons anybody could guess, and it's not only me. I have to help and to support a number of customers needing the tool although not having Oracle knowledge as their primary skill (and still being programmers or testers). I often advise them to roll back to SQL Developer 2, altogether that actually isn’t a solution, moreover since they aren’t fixed in the project – somebody goes and somebody comes, that sort of things.
Edited by: Uldis Pavuls on Nov 9, 2011 5:51 PM

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