IE 10 not using proxy settings

Odd one this. Our proxy server address is distributed to client workstations through GPP. Just lately, and I can't think of a reason why, users have been complaining that they are presented with the authentication page for our proxy server, which is usually
presented when no proxy details have been set within IE. So, I check the proxy details, and they are present! If I untick the checkbox for 'use automatic configuration script', recheck it, OK, close the window, and refresh the page, all is good again. It's
like IE is forgetting that the details are there - any ideas? 

we see this happening in our environment, when users save their credentials (IE offers to save userid/password for a URL/domain), and, the user then undergoes an AD password change/expiry.
They visit the URL again, after changing their AD password, but the browser/Windows will recognise the URL, supply the saved (stale) credentials, which are not accepted, so a basic auth challenge dialog is raised.
Maybe you are seeing something similar, although if it goes away when you re-assert the auto-config setting, your issue may be different.
Don
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