Problem:
In a XenApp environment, user's default printers get reset the next time they log in, or not load a all when printing is controlled with Citrix.
Symptoms:
No printers load or default printer is changed at random.
Possible Resolution(s)
Normally one would disable the Client.NET Printers (ProfileUnity) module by adding GPO group policy.
See the screenshot below.
Product: ProfileUnity
Product Version: 6.5+