logwtmp not showing logged in with who

I have a new machine with Ubuntu 11.04 and I cannot see logged in users anymore with 'who', I can see them in 'last'.  This doesn't match with what I'm seeing on my Ubuntu 10.04 servers and I've verified the pptpd.conf file and it does have 'logwtmp' uncommented, I thought that was all I needed to have it show logged in users, did I forget something?

This is what I see in last :

ian      ppp0         24.246.10.174    Mon Jul  4 17:36   still logged in   

versions:

pptpd v1.3.4
2.6.38-8-generic 


thanks,
-justin
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