Ohhhh jeeee: can't encode a 512 bit MD into a 608 bits frame

[Philip Jackson]

Using UbuntuStudio 1404 (and updates), gnupg 1.4.16 and gnupg2 2.0.22 (ubuntu
installation)

I came across this line (see subject) in an enigmail debug log recently and it
was held as the likely cause of the display of an alertbox containing absolutely
no information.

Now today, while using the command line to check some public keys, I came across
the same message.

using :

gpg -k  : this gives what appears to be a normal listing terminating normally.

but

gpg2 -k : gives a shorter listing which is terminated by :

> gpg: Ohhhh jeeee: can't encode a 512 bit MD into a 608 bits frame
> Aborted (core dumped)

What causes this with gpg2 and not with gpg and what does it mean ?  How should
I recover this situation ?

Thanks,
Philip

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