Just found a bug with backtools + cogwheels. If you just switch from cogwheel to other item, or place it (It goes on your back as old tool) Inventory window no longer appears until you switch to other tool and to something else (put other tool on back).
Console says multiple times:
Code:
java.lang.NullPointerException
[23:29:39] [Client thread/ERROR]: ########## GL ERROR ##########
[23:29:39] [Client thread/ERROR]: @ Post render
[23:29:39] [Client thread/ERROR]: 1283: Stack overflow
[23:29:39] [Client thread/ERROR] [FML]: Exception caught during firing event net.minecraftforge.client.event.RenderPlayerEvent$Specials$Post@9fb0222:
java.lang.NullPointerException
[23:29:39] [Client thread/ERROR] [FML]: Index: 1 Listeners:
[23:29:39] [Client thread/ERROR] [FML]: 0: NORMAL
[23:29:39] [Client thread/ERROR] [FML]: 1: ASM: backtools.common.core.EventHandler@46c37c29 onPlayerRender(Lnet/minecraftforge/client/event/RenderPlayerEvent$Specials$Post;)V
[23:29:39] [Client thread/ERROR]: Couldn't render entity
java.lang.NullPointerException
[23:29:39] [Client thread/ERROR]: ########## GL ERROR ##########
[23:29:39] [Client thread/ERROR]: @ Post render
[23:29:39] [Client thread/ERROR]: 1283: Stack overflow
[23:29:39] [Client thread/ERROR] [FML]: Exception caught during firing event net.minecraftforge.client.event.RenderPlayerEvent$Specials$Post@3e490b4c:
java.lang.NullPointerException
[23:29:39] [Client thread/ERROR] [FML]: Index: 1 Listeners:
[23:29:39] [Client thread/ERROR] [FML]: 0: NORMAL
[23:29:39] [Client thread/ERROR] [FML]: 1: ASM: backtools.common.core.EventHandler@46c37c29 onPlayerRender(Lnet/minecraftforge/client/event/RenderPlayerEvent$Specials$Post;)V
[23:29:39] [Client thread/ERROR]: Couldn't render entity