filesets-menu-ensure-use-cached

filesets-menu-ensure-use-cached is a variable defined in `filesets.el'.
Its value is

nil

Documentation:
Make sure (X)Emacs uses filesets' cache.

Well, if you use XEmacs (prior to 21.5?) custom.el is loaded after
init.el. This means that settings saved in the cache file (see
`filesets-menu-cache-file') will be overwritten by custom.el. In order
to ensure the use of the cache file, set this variable to t -- which is
the default for XEmacs prior to 21.5. If you want to change this value
put "(setq filesets-menu-ensure-use-cached VALUE)" into your startup
file -- before loading filesets.el.

So, when should you think about setting this value to t? If filesets.el
is loaded before user customizations. Thus, if (require 'filesets)
precedes the `custom-set-variables' command or, for XEmacs, if init.el
is loaded before custom.el, set this variable to t.