id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
24539	JOSM interface seems to glitch out and break down at random points during normal mapping	singularsingular@…	team	"==== What steps will reproduce the problem?
1. Load up JOSM
2. Begin to map
3. Bug eventually occurs

==== What is the expected result?
For the interface to stay in tact and not duplicate and spread everywhere.
==== What happens instead?
The GUI seems to break down and scatters across the screen and duplicates ghosts of itself.
==== Please provide any additional information below. Attach a screenshot if possible.
I recorded my entire mapping session and trimmed it down to right before the bug occurred. This bug has been happening every since I installed JOSM for the first time ever (No plugins, tags, etc). The only pattern I can maybe seem to recognize is opening a window/dialog box seems to trigger this bug but its only a chance the bug occurs. Sometimes I can go mapping for a good 25 minutes and not have the bug while other times im mapping for 3 minutes and the bug happens. 
https://imgur.com/a/T6ZLya2
{{{
Revision:19439
Build-Date:2025-09-01 09:22:37

Identification: JOSM/1.5 (19439 en) Windows 10 64-Bit
OS Build number: Windows 10 Pro 22H2 (19045)
Memory Usage: 960 MB / 24448 MB (452 MB allocated, but free)
Java version: 21.0.8+9-LTS, Azul Systems, Inc., OpenJDK 64-Bit Server VM
Look and Feel: com.sun.java.swing.plaf.windows.WindowsLookAndFeel
Screen: \Display0 2560x1080x32bpp@120Hz (scaling 1.00×1.00) \Display1 1920x1080x32bpp@75Hz (scaling 1.00×1.00)
Maximum Screen Size: 2560×1080
Best cursor sizes: 16×16→32×32, 32×32→32×32
System property file.encoding: UTF-8
System property sun.jnu.encoding: Cp1252
Locale info: en_US
Numbers with default locale: 1234567890 -> 1234567890
VM arguments: [-Djpackage.app-version=1.5.19439, -XX:MaxRAMPercentage=75.0, --add-modules=java.scripting,java.sql,javafx.controls,javafx.media,javafx.swing,javafx.web, --add-exports=java.base/sun.security.action=ALL-UNNAMED, --add-exports=java.desktop/com.sun.imageio.plugins.jpeg=ALL-UNNAMED, --add-exports=java.desktop/com.sun.imageio.spi=ALL-UNNAMED, --add-opens=java.base/java.lang=ALL-UNNAMED, --add-opens=java.base/java.nio=ALL-UNNAMED, --add-opens=java.base/jdk.internal.loader=ALL-UNNAMED, --add-opens=java.base/jdk.internal.ref=ALL-UNNAMED, --add-opens=java.desktop/javax.imageio.spi=ALL-UNNAMED, --add-opens=java.desktop/javax.swing.text.html=ALL-UNNAMED, --add-opens=java.prefs/java.util.prefs=ALL-UNNAMED, -Djpackage.app-path=%UserProfile%\AppData\Local\JOSM\JOSM.exe]
Program arguments: [%UserProfile%\OneDrive\Desktop\JOSM\Mapping.osm]
Dataset consistency test: No problems found

Plugins:
+ buildings_tools (36438)
+ geochat (36438)
+ imagery_offset_db (36438)

Tagging presets:
+ https://raw.githubusercontent.com/yopaseopor/traffic_signs_preset_JOSM/master/US.zip
+ https://josm.openstreetmap.de/josmfile?page=Presets/public_bookcase&zip=1
+ https://josm.openstreetmap.de/josmfile?page=Presets/Playground_Equipment&zip=1
+ https://josm.openstreetmap.de/josmfile?page=Presets/NewTags&zip=1
+ https://josm.openstreetmap.de/josmfile?page=Presets/Leaftype&zip=1
+ https://josm.openstreetmap.de/josmfile?page=Presets/Golf_Course&zip=1

Map paint styles:
+ https://raw.githubusercontent.com/tordanik/direction-cones-style/refs/heads/main/direction-cones.mapcss

Last errors/warnings:
- 00000.356 W: extended font config - overriding 'filename.Malgun_Gothic=malgun.ttf' with 'MALGUN.TTF'
- 00000.358 W: extended font config - overriding 'filename.Myanmar_Text=mmrtext.ttf' with 'MMRTEXT.TTF'
- 00000.358 W: extended font config - overriding 'filename.Mongolian_Baiti=monbaiti.ttf' with 'MONBAITI.TTF'
- 00001.117 E: java.security.KeyStoreException: Windows-ROOT not found. Cause: java.security.NoSuchAlgorithmException: Windows-ROOT KeyStore not available
}}}
"	defect	new	major		Core			template_report