I spoke too fast! It doesn't work with dialogs without title. 
Sorry, I give up for the moment.
Any ideas?
EMG
Board index Bugs report & fixes / Informe de errores y arreglos Bug in TDialog title [Solved]
I forgot to mention that with the latest FWH (14.02) the problem seems to be vanished. 
EMG
Antonio,
why are you still imposing the limit of 140 characters in dialog title?
I think it's not needed anymore. Can you confirm?
EMG
why are you still imposing the limit of 140 characters in dialog title?
::cCaption = If( cCaption != nil, SubStr( cCaption, 1, Min( Len( cCaption ), 140 ) ), nil )I think it's not needed anymore. Can you confirm?
EMG
Enrico,
Have you tried to remove it and check if it works fine ? If so, yes, we can remove it
Antonio,
yes, I'm currently using a version of dialog.prg without it and found no problem. But it should be better if you tested it in all the Windows flavors.
EMG