forms authentication failed for the request. reason: the ticket supplied was invalid

Is there anyway to tell why the ticket is invalid?
This is a forms authentication ticket shared across servers. Latest OS, Service Pack,  and IIS
The machine keys and encryption methods specified are the same.
The servers have the same time and timezone.
The FIPS registry setting is the same (0).
The server OS and patches are the same.
This ticket works on 6 other servers but not this one.
PLEASE PLEASE don't send me any links to look at or respond to this post, unless the links or your comments address things that haven't been already stated!!!!!!!!!!!!!!  I really don't want to hear about making sure the machine keys are the same, or .net framework patch issues, or UTC time issues.

Thanks, Chuck

Event code: 4005
Event message: Forms authentication failed for the request. Reason: The ticket supplied was invalid.
Event time: 1/24/2012 8:39:31 AM
Event time (UTC): 1/24/2012 3: ...