Menu is missing!

After I install the theme and the menu missed. When the mouse pass the location of the menu, it appears as follows. How to solve this? Thank you.

 

Please share the link of your website.

 

http://223.4.158.139/

Thanks.

 

why the menu is OK, but the slide disappeared? I do not do anything.
Its' urgent!

Thank you.

 

Go to
Appearance > Theme Option > General Setting > Front Page On/Off
and make it on.

 

It is always ON! But the slide image still missing and the menu is OK.

 

I did nothing. I visit the web page this morning. In the beginning, the menu displays right. After opening several pages, the menu disappears again!!!!! And the slider images always not shown!!!!!!!!!!!
Please help me!!!!!
or give me your email, I send you username and password of the web.

http://223.4.158.139/
http://223.4.158.139/?cat=5
http://223.4.158.139/?page_id=57
http://223.4.158.139/?page_id=35
http://223.4.158.139/?page_id=17

 

I've done some tests. Sometimes the menu is disappeared and sometimes the slider disappeared. In a word, they seldom show together!
Sometimes they are both shown in preview but not shown together in normal web page. Sometimes in both preview and normal web pages, they are not shown together!!