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Hamic, you say you can post messages but the forum comes up blank.
Where are you posting the messages from if you get a blank page when you go to the forum page?
I suggest going into the forum admin and looking at the settings you made for your forum(s) and see if you made the forum access for everyone or just one certain group. Plus check your groups admin and make sure you set the forums access for all the webmasters and any other group that you want to be able to see the forums. It has to be the module access block for the forums that is checked for the groups, in order for a group to view the forums.
But that is just for no permission pages that come up. If you have a blank page coming up, then that means you could have some of your newbb files corrupted. You could try comparing the size of all the files in your newbb module folder with the files on your home computer to see if they are the same size.