2 problems.
 

Ok so i have been updated a few new buttons and pictures for forums and its isnt showing them in the forum.
its happen only in the FF browser in the EXPLORER all fine.
so anyoen can help me with this?

Another problem
after i upgraded to 3.8.1 i have a few problems like when i go to index page its show me an erorre "page not found" and then when i press refresh all working fine.
do you know what to do with this?

Do a force refresh in the page (F5 or ctrl+F5 on a PC, shift+apple+r on a mac) to make sure your browser grabs the images fresh from the server and doesn't use it's cache.

ok and what about the second problem?

I would check out the error_logs to see what is happening. If you don't know where they are, ask your host.

the error_logs are in the control panel of my ftp\host?

For me, they are in my site folder under the /logs directory. There are both access_logs and error_logs there. As I said, you may have to ask your host where they are.

ok i find them now what?

You look in them and see if you produced an error when you clicked on the page and if you did, you see what that error was.

I have alot of errors there hh

You should check the paths to make sure they are pointing to the correct forum location. The file not found error screen should tell you what it is trying to find. Seems like if it worked before the upgrade and now it doesn't then you have done something the change the path when you did the upgrade. Check vboptions and your config.php file to be sure they are pointing to the correct location.