The newest TravianZ files do not require Chmodding. I don't think so... if it does then it should say in the instructions. If you are using an older version than you will probably experience bugs.
I have always found Chmodding to kinda be guess and check for me. Play around with it for a bit and if you need further help feel free to add me on skype.
Delview9994
Actually, if you wan't to know what really happens is that it all depends on how your install. Some hosts you don't have to chmod, some do. The way the install tells you to install is wrong and it will not work.