I guess most of you encountered some BPC web issue, such as the top bar is loaded, but the middle area is blank. Or the left navigation bar is loaded, but when you click one of sub menus, nothing appears. Sometimes, this happens because of one bug. See note 1804221 – Web Home Page doesn’t load correctly after upgrading SP. Also, you may fix the issue by clearing IE cache, etc.
However, the issue may still unsolved ever you tried all you could think of. If so, this issue may be caused by something wrong in the server. Bundle version inconsistence may be one of the reasons on the server side. You can find detailed information on KBA 2013954 – Synchronize bundle version to fix BPC web issue – BPC NW 10.0
Below are a KBA summary related to BPC web issues. Hopefully it’s useful to fix your web issue.