MyBB Community Forums

Hi, I have very strange problem, for me my forum work fine, if I put english or croatian its work, for some of my buddy also work fine both language, bud some people only see blank page when I put croatian language, and some people been redirected to root of page my url is www.someaddres.com/forum and someone been redirected to www.someaddres.com , if I put english everything work fine,

again back to croatian and some people can see forum, some people cant, just blank page, or canot page display, or been redirectde to root of domain.

Any Idea

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and url in post is not real , to not confuse