upload unpossible; no loading of background image

[chr.ax@…]

What steps will reproduce the problem?

1. Start josm. load a small area. activate background images "Maps4BW", "MapBox" and "Bing".
2. Make some edits to the map.
3. Load a bigger area.
4. Upload the made changes

What is the expected result?

3.: At step "3.": the background images should load the background for the new (bigger) area.
4.: At step "4.": The upload should be finished within 30 seconds.

What happens instead?

3.: All background images does not load at the new area (the old area stays shown). Activating / deactivating the visibility of an background image does'nt solve the problem.

4. The upload does not end. After click on "cancel" nothing happens. After click on the "X" of the upload window, the upload stops.

Please provide any additional information below. Attach a screenshot if possible.

The problem did occur only with the new jnlp version. I have been using this version for approximately one week. Before I used the normal java version (jar) and I never had any stability issues.

URL:http://josm.openstreetmap.de/svn/trunk
Repository:UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last:Changed Date: 2016-01-06 17:30:31 +0100 (Wed, 06 Jan 2016)
Build-Date:2016-01-06 16:32:31
Revision:9329
Relative:URL: ^/trunk

Identification: JOSM/1.5 (9329 de) Windows 10 64-Bit
Memory Usage: 247 MB / 247 MB (40 MB allocated, but free)
Java version: 1.8.0_66, Oracle Corporation, Java HotSpot(TM) Client VM
VM arguments: [-Djava.security.manager, -Djava.security.policy=file:C:\Program Files (x86)\Java\jre1.8.0_66\lib\security\javaws.policy, -DtrustProxy=true, -Djnlpx.home=<java.home>\bin, -Djnlpx.origFilenameArg=C:\Users\Anwender\AppData\LocalLow\Sun\Java\Deployment\cache\6.0\56\1ee8cfb8-5a2cc7ab, -Djnlpx.remove=false, -Djava.util.Arrays.useLegacyMergeSort=true, -Djnlpx.splashport=57850, -Djnlp.application.href=https://josm.openstreetmap.de/download/josm.jnlp, -Djnlpx.jvm=<java.home>\bin\javaw.exe, -Djnlpx.vmargs=LURqYXZhLnV0aWwuQXJyYXlzLnVzZUxlZ2FjeU1lcmdlU29ydD10cnVlAC1Eam5scC5hcHBsaWNhdGlvbi5ocmVmPWh0dHBzOi8vam9zbS5vcGVuc3RyZWV0bWFwLmRlL2Rvd25sb2FkL2pvc20uam5scAA=]
Dataset consistency test: No problems found

Plugins:
- BuildingGeneralization (UNKNOWN)
- Create_grid_of_ways (31772)
- DirectDownload (31934)
- FixAddresses (31772)
- HouseNumberTaggingTool (31772)
- ImportImagePlugin (31772)
- Mapillary (31976)
- OpeningHoursEditor (31772)
- RoadSigns (31895)
- SimplifyArea (31895)
- apache-commons (31895)
- apache-http (31895)
- areaselector (263)
- buildings_tools (31895)
- contourmerge (1014)
- download_along (31772)
- ejml (31895)
- geotools (31895)
- gpxfilter (31772)
- graphview (31895)
- imagery_offset_db (31895)
- jts (31772)
- kendzi3d-jogl (41)
- kendzi3d-resources (0.0.1)
- log4j (31895)
- measurement (31895)
- merge-overlap (31967)
- openvisible (31772)
- print (31895)
- public_transport (31895)
- public_transport_layer (31932)
- terracer (31895)
- todo (29154)
- utilsplugin2 (31895)

Last errors/warnings:
- W: java.net.UnknownHostException: gis3.stuttgart.de
- W: java.net.UnknownHostException: gis3.stuttgart.de
- W: java.net.UnknownHostException: gis3.stuttgart.de
- W: java.net.UnknownHostException: gis3.stuttgart.de
- W: java.net.UnknownHostException: gis3.stuttgart.de

[stoecker]

Did you wait a longer time. Browsers limit the number of allow synchronous connections. You cause lots of connections by the map load and then try upload. Maybe it only takes REALLY long until this is actually tried?