can't update MS Windows bugs, "Platform" blank

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I've filed a few bugs, e.g. http://bugs.kde.org/show_bug.cgi?id=156080 
and 156690.

When I try to update them, I get the error:

  Bugzilla has suffered an internal error. Please save this page and 
send it to owner at bugs.kde.org with details of what you were doing at the 
time this message appeared.

  URL: http://bugs.kde.org/process_bug.cgi
  A legal Platform was not set.

Indeed, my bugs have no platform.  The only way I can enter a bug is 
with http://bugs.kde.org/wizard.cgi which doesn't give me a Platform 
choice.  I choose "MS Windows" as Operating System during the Wizard and 
fill in most fields.

So I think there's a bug with the bug wizard?

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=S Page