SQL Developer 1.5.1 won't display UI any longer...

Howdy, y'all; I'm using SQL Developer 1.5.1 on a laptop with Windows XP Pro SP3, fully patched, and 2 GB of memory. I try to run the system efficiently with as few processes and services as necessary, so as to avoid compatibility problems. All other apps, including Office 2K3 are fully patched.
I'm trying to export data from an Oracle 10.1 instance; it worked for a while, but now SQL Developer doesn't run. In Windows Task Manager, I see "sqldeveloper.exe" as a process using ~95 MB of memory, but no CPU; the UI doesn't appear beyond the startup tips dialog.
I changed the UI style from "Oracle" to "Windows" in the Preferences dialog, just to see what it would look like. Might this have broken SQL Developer? Don't wanna re-install if it's not necessary.
Thanks for your assistance.
Sincerely,
APJ in The OC, SoCal.

I had a similar issue, icons and display window was all messed up and mousing over made things worse.
Solution
I noticed that errors were being logged on the logging page tab, errors like:
source : o.jt.ui.themes.ThemeProperties
Message: Failed to load icon etc.
Somehow the default Fusion Blue theme has gotten corrupted and I can't get it back. I changed the Theme and now it works fine. Tools -> Preferences -> Environment -> Theme pulldown box. FYI - I'm using the Oracle look and feel setting.
Clues
Logging on as another user on the same machine didn't have problems with the Fusion Blue theme.
Anyone know where these themes are stored? There should be a error handling routine in the code for this situation.
_Things that didn't work_
- Messing with the Java SDK versions
- Delete and re-install
- Switching between the versions that did and didn't include the Java SDK
- Delete c:\documents and settings\user\Application Data\SQL Developer directory didn't work either, but now my DB connections settings are gone. :( At least the software is usable again.

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This post has been branched off from and refers to
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@user 867945,
Please do not resurrect long dead threads.
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Post your own new inquiry so that anyone that responds is answering YOU.
Feel free to provide a reference link to any discussion, anywhere, that may be somehow similar.

SQL Developer 1.5.1 won't display UI any longer...

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