PHP in Templates and Template Conditionals

[Yumi]

I make changes ok and after changes works not code what i put in index template (throught admincp), that only guest can see slideshow - result was that all usergroups can see slideshow, (mean members of board) - that is what i try to explain to you!

Did you try my uploaded file?
Otherwise, I don't know how to help you, as the code you posted works fine for me here, and I can't really see any reason why it shouldn't. Could you test it on a clean MyBB install with just the plugin file I uploaded?

for now have problem with characters in posts (croatian)... maybe you have some solutions?

I don't think this would be caused by this plugin, but is your database in UTF-8?