That is not common issue and most of menus working fine, but for some of them I have got this:

Notice: Undefined index: menu-produktmeny in menu_tree_build() (line 304 of menu_block.module
Notice: Undefined index: title in menu_block_get_title() (line 413 of menu_block.module

Patch attached in case if somebody has similar issue...

Comments

This is the last patch but can be applied to:
Menu Block 7.x-2.3

Issue summary:View changes
StatusFileSize
new968 bytes

Removed full path to module file in patch.

// BoboDrone