Persistent IE Configuration

Persistent IE Configuration

Hi there,
 
We have a couple of configurations for collections which set an IE homepage for users, a proxy, and depending on where they sit in AD also either prevents or allows them to turn the proxy off.
 
Recently we changed our sharepoint which is what the homepage is set to. The old url set through configuration pointed to http://sharepoint2008 and the new url is http://sharepoint2013 
The old configuration was modified to reflect the change and redeployed. Worked fine at the time, but then within a few days the old configuration came through again, pointing uses back to sharepoint2008. We've deleted the configurations and recreated them with the new url, redeployed and the same thing happens again. Users are fine for a day, or a few days, and then the homepage changes back to 2008.
 
I've updated desktopcentral to the latest build 90033...all agents are updated since applying the latest patch, but that hasn't resolved the issue either.
 
 How can we stop this from happening? I understand i could turn off the configuration settings for Detect and Apply, but that wouldn't really be fixing the underlying issue.
 
Cheers,
Ash.
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