I'm sorry, but KP DID respond to you, within 4.5 hours:
>> If you want somebody to address the problem, then you should probably be contacting Sparx support rather than posting on a user forum. There is a link to the bug report form at the bottom of the page. (Sorry I can't help you myself but I can't reproduce the problem on my system). <<
He tried to test your problem, based on the very limited information you provided, and was unable to reproduce the 'bug'. So he directed you to the official channel, which will solicit specific information from you and which will direct your problem to the developer in whose area of expertise the issue lies (and who is probably one of the developers who doesn''t read the forum, since it was set up for USERS to discuss things amongst themselves, not as a vehicle for users to contact Sparx employees).
A small number of Sparx employees do participate on the forum and provide assistance, but only in the same capacity as the users - voluntarily, when they have time, without obligation and without guarantee. If you want an official response, use the official channels.