[p4] Client 'xxx' can only be used from host 'yyy' ?

[Dimitri Rakitine]

My P4V client (OS X, intel) was working just fine until today. Now I'm 
getting this error:

Client 'java' can only be used from host 'DimaBook.local'.

which doesn't make any sense: 'DimaBook.local' is the machine name I run 
P4V on.
Is there any way to get rid of this error?

TIA
Dimitri