no valid user IDs after changing key expiration time

[Daniel Kahn Gillmor]

On Wed 2015-07-22 13:05:04 -0400, flapflap wrote:
> Ludwig Hügelschäfer:
>> On 22.07.15 16:36, flapflap wrote:
>> 
>>> Should I be worried by the warning or is this normal behaviour?
>> 
>> You should set ultimate ownertrust on your own key after
>> (re-)importing. Then it will become valid again.
>
> My key still looked/looks valid, even without changing the ownertrust
> (in that case its ownertrust is just shown as unknown).  All UIDs are
> present.
>
> What seems strange to me is that I do not see the warning message when I
> import the previous version of my key (exported about a year ago).
> The warning only appears when I change the expiration time of that key,
> export it, delete it, and then re-import it (including secret key).

can you share the fingerprint of the key in question?  have you tried
this with a more recent version of GnuPG than 2.0.25 ?

     --dkg