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User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.6)
Gecko/20040115 Epiphany/1.0.7

Description of problem:
Starting gnome-file-types-properties does not allow the creation of
new MIME types.

Running it from the command line delivers the following in the terminal:

(gnome-file-types-properties:5874): GLib-GObject-WARNING **:
g_object_set_valist: construct property "is-add" for object
`MimeEditDialog' can't be set after construction



Version-Release number of selected component (if applicable):
control-center-2.5.2-3

How reproducible:
Always

Steps to Reproduce:
1. Run gnome-file-types-properties
2. Click the "Add File Type..." button
3. Check terminal screen for result
    

Actual Results:  No response from application, error dump on terminal
window.

Expected Results:  The "MimeEditDialog" should open, allowing the
addition of new MIME types.

Additional info: