"Open file" dialog breaks josm when browsing directories

[Cobra]

When browsing a directory and scrolling (even just by selecting a file with a name not completely visible), said dialog breaks: all texts disappear, buttons are blank. After closing that dialog (by pressing esc), josm looks normal until opening any menu. This menu will be blank as well and all text covered by this menu disappear after closing the menu again. JOSM is then really unusable and must be terminated.
Opening a file without scrolling works fine though.

Other JOSM versions tested: r3380, r3561 - all are affected.

Other java applications didn't show the same problem up to now.

I'm using ubuntu 10.10 Beta/64 Bit now, I didn't notice this behaviour with my old system (ubuntu 10.04/32 Bit).

This bug can be easily reproduced:

Repository Root: http://josm.openstreetmap.de/svn
Build-Date: 2010-09-24 01:31:09
Last Changed Author: stoecker
Revision: 3558
Repository UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
URL: http://josm.openstreetmap.de/svn/trunk
Last Changed Date: 2010-09-23 18:36:36 +0200 (Thu, 23 Sep 2010)
Last Changed Rev: 3558

Identification: JOSM/1.5 (3558 en)
Memory Usage: 62 MB / 622 MB (37 MB allocated, but free)
Java version: 1.6.0_20, Sun Microsystems Inc., Java HotSpot(TM) 64-Bit Server VM
Operating system: Linux

Plugin: ElevationProfile (288)
Plugin: PicLayer (22549)
Plugin: alignways (23165)
Plugin: colorscheme (21563)
Plugin: measurement (22547)
Plugin: openstreetbugs (22723)
Plugin: openvisible (21706)
Plugin: remotecontrol (22734)
Plugin: reverter (23278)
Plugin: validator (22805)
Plugin: wmsplugin (23207)