I have a unique issue. Our default 'Windows Group Policy', which the sys
admin would prefer not to change, sets the proxy server and is defined to
apply at login. I have an application that runs at login that unsets this
setting for certain users, but it appears as if the policy is being
applied randomly for some users during the day.

I have tried to isolate what could be causing this but am out of ideas.

My question is, does the GPO get applied by Zen after login?