Did you read the thread? I'm pretty sure no one rebutted my claim that it doesn't work with Cisco ACS.
Yes, I recall seeing it. Not sure, if it's something ACS-specific. Probably almost nobody using ACS, which is why you didn't get many/any replies confirming or denying specifically with ACS.
Not sure what to tell you, I'm not familiar with ACS, not exceptionally familiar with RADIUS, and haven't seen any problems.