I'm having a little problem when trying to use MOG_BattlebackEX and YEP_BattleEngineCore plugins simutaneously.
The only Battleback Ex's feature I want to use is upper/lower battlebacks, but when I use it with Battle Engine Core, all the battlebacks go "behind" the enemies. Here's a screenshot, the blurred part should be above the enemies. The plugin commands are OK, just tested it without "YEP_BattleEngineCore" and it works.

I'm using the last version of each plugin.
http://yanfly.moe/2015/10/10/yep-3-battle-engine-core/
https://atelierrgss.wordpress.com/rmv-battleback-ex/
Thanks.