Enumshares works sometimes

It must be my day for problems. I just posted about an issue with enumservers, and now I'm seeing weirdness from enumshares as well. If I ask it to enumerate the shares of my machine named Ancalagon, here's what I get:

enumshares /a \\Ancalagon\*
\\Ancalagon\ADMIN$
\\Ancalagon\C$
\\Ancalagon\D$
\\Ancalagon\F$

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But if I ask it to enumerate the shares of my machine named Tirion, here's what I get:

enumshares /a \\Tirion\*
TCC: (Sys) The format of the specified share...

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