[racket] problem with 5.1 dmg for mac?

Is any one else having trouble opening the .dmg file that was just released?
I open the file (either for the binary, or the source) and get the error
message ""no mountable file system".

Just want to make sure something is screwy on my machine, not with the
distribution.

I'm on OSX 10.6.5, Intel

ben
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