Could not delete a class

Hallo users.
I'm using Umbrello version 1.5.6 and i got this problem.
When i try to delete a class from the left pane and i save the document all
is fine untile next document open; infact when i reopen it i can see a class
named for example
UJHX28VXbOqI; i try to delete it again and when i repone it i get a new
class with for example this name qVL63yeJalIe.
Any idea how to remove e class without being prompted next time?

Regards

Mazi
-- 
Massimo Ugues
http://m4zi.wordpress.com/
http://www.flickr.com/photos/m4zi/

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