Sorry for not putting my findings here...

It was indeed Gimp that is not 100% PSD compatible.
I opened the PSD header in Photoshop and all layers were shown correctly and I could edit them.

I hope this helps someone else

Thanks for your reply man!

But I think I found what is the problem.
I am using the gimp and it seems that it does not make it able to edit all layers correctly.

A friend of mine said he can edit it so I will try it later in photoshop.

I did not find any psd identical with the revolution header that was used on this site. I did find one revolution psd that you could use. I need to ask permission to release that psd thou. I'll return with a answer later today. I just want to say the following so we are not speaking about something...

Hi all, I am very bad at graphical stuff but I would like to use the Revolution theme. THe only thing about it that I want to change is the title. However in the psd I cannot edit the title :s (I am using the Gimp). As I am not good with graphical stuff it would be easiest to just edit the title and...