I have defined a Hudson job with a single cvs module; one that contains spaces
in its name. I am using the backslash escape character as specified by the
documentation, and the module is checked out correctly by CVS. Only problem is
that each time i modify the job configuration and save it, the "Legacy mode"
becomes checked even though I explicitly unchecked it. The only way to force
hudson to uncheck it is by changing the "flatten"-element in the config.xml-file
and then re-read the hudson configuration.

My guess is that Hudson has a mechanism that forces the "Do Not Flatten"-mode
(the "Legacy Mode") whenever multiple CVS modules is defined in a job which
makes perfectly sense since it would be unwise to flatten multiple modules into
the same directory. However, when a single module contains spaces, this
mechanism is tricked into believe that there is multiple modules probably
because it still uses a simple "look for spaces"-strategy to decide if several
modules is defined.