Hello, I'm following up to a previous thread in which Error ID 5566 was discussed.
To recap, this error is thrown by InfoPath browser-enabled forms after the SharePoint server farm is upgraded to .NET 3.5 framework SP1. Prior to that, the forms worked fine. 
zeroecho provided a procedure to fix this problem. It involves adding a registry key to all the farm servers. Please follow this link to read the procedure: http://www.infopathdev.com/forums/p/7676/38688.aspx.
**However, once I had added this registry key in my development farm and got my form to work (without error 5566), the fix seems to be permanent -- i.e., I subsequently removed the registry key, rebooted the farm servers, and my form continued to work.
Can anyone share his/her experience after applying the fix? The reason I want to back out the fix is to demo that the fix works in test before implementing production.
Thanks in advance.