[Opera-Linux] reset master password ?

[Pomarede Nicolas]

Hello,

I'm using opera-9.50-1992 and as I was trying to use a personnal 
certificate stored in opera, I'm asked for a master password, which I'm 
pretty sure I never defined.

I tried to change it in preference/security, but none of the usual 
passwords I tried in 'old password' are recognised.

I wonder if this could have been messed when upgrading from different 
opera version ; is there a way to reset this password ? I don't use it 
anywhere, so I would just like to select a new one.

Thanks

Nicolas