hy to all

i installed concrete 5521 on 3 servers and i have the same errors.
It works well on the default template greek yogurt, but in the other old template it not shows the main menu and slide show. I also canot do an horizontally menu, I can do only vertical menu.
It has bugs this version.
I work with concrete 5 for about 1 year , very well but with older version than 52xx.

Should I stay away from 5521?
Regards
Daniel