Problem whit Show price after login

I do not know if it's my problem or common, I'm using OpenCart 1.5.4 with the default template, I installed the classic forms "most visited" "last seen" "featured products".
When I set "show prices after login" to YES, everything works fine, but from the home page, and I repeat only the home page, all modules (boxes) are hidden and change me too much of the layout.
If I set to NO, all returns as before.
Do you have any suggestions? I do not know where to look