I understand it's not a WPMU plugin but we basically run our business on WPMU plugins (marketpress, membership, affiliates, and a few others) and figure it may be a conflict. Here is the issue cross posted:
Custom Redirection works, but only on other actions (like logging out), but it will not work on log-in, and I have exhausted troubleshooting endeavors and am now at a loss. I was hoping I could get through this without having to stop and ask for directions.
Calling Jeff Farthing - I have tried your troubleshooting advice and deactivated all plugins except TML, but get the same issue.
60daymba.com/log-in/ will not redirect as requested to 60daymba.com/members/
HOWEVER, 60daymba.com/log-out/ WILL redirect to 60daymba.com/members/ as requested. I do not currently know how to use this piece of information but my gut says this is what to focus on and that I'm missing something very simple.
Please help. I have some fiddler logs and a few other debug logs I could post if you need them.