I can start the client, it asks me whether I want to trust and run the
webstart application, and the slave starts up and reports "connected".

When I look in my master webpage, I see that the slave is marked available,
but I can't see any information in the "System Information" page. Also the
log entry is completely empty.

When I try to start a build on the remote machine, the build ends very fast,
and the buildlog contains a message like below:
--------------
started
Building remotely on experimental
FATAL: access denied (java.io.FilePermission d:\temp\hudson\workspace\Java
Preferences Plugin read)
java.security.AccessControlException: access denied (java.io.FilePermission
d:\temp\hudson\workspace\Java Preferences Plugin read)
at java.security.AccessControlContext.checkPermission(Unknown Source)
at java.security.AccessController.checkPermission(Unknown Source)
at java.lang.SecurityManager.checkPermission(Unknown Source)
at java.lang.SecurityManager.checkRead(Unknown Source)
at java.io.File.exists(Unknown Source)
at java.io.File.mkdirs(Unknown Source)
at hudson.FilePath$3.invoke(FilePath.java:227)
at hudson.FilePath$3.invoke(FilePath.java:225)
at hudson.FilePath$1.call(FilePath.java:176)
at hudson.remoting.UserRequest.perform(UserRequest.java:57)
at hudson.remoting.UserRequest.perform(UserRequest.java:22)
at hudson.remoting.Request$2.run(Request.java:167)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
---------------------------

• The directory D:\temp\hudson is created, and afaik writable for all users.
• The gui of the slave does not change, nor does it show info on the
  console.
• The jobs also fail when they do not contain spaces
• The jobs also fail on Linux.
• I'm using the released version of 1.81, but also in my custom build of 2
  days ago it failed.