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I changed the graphical verion of the site, but I still see the same one

Web browser achieve high efficiency and speed mostly thanks to their temporary storage area, where frequently accessed data can be stored for rapid access, called cache. Such solution, between many advantages, has some disadvantages. In cache Cascading Style Sheets and site templates are stored. When they change, You may not experience it.

To fix the issue treat Your browser twicely with CTRL+F5 comibnation (alternatively clear Your cache).

If it wont help, then the fault is somewhere in the system. Please inform the administrators about error occurance.