AN2

In Tekkit lite I'd gotten used to the functionality of (in creative mode) being able to replace the block you were currently holding with the targeted one by middle clicking. In Tekkit, I'm finding that the click appears to work - that is, I hold the block I chose - but the second I try and place it it is replaced with the block that was previously in my hand. It works most of the time if I have no block in hand - but often I'm left holding nothing again, and the placed block disappears. The revert also happens if I try and move the copied block in my inventory. I have reproduced this in multiple "dimensions" and at a significant distance from the spawn. Hopefully that's somewhat clear. I can provide further information as needed.