Issue loading storyboard in interface builder

I am building an app in Xcode 7.3.1 and it runs on devices and the simulator just fine, displaying the cells in my collection view.. but in interface builder the collection view cells do not appear..

I can't state how to recreate this scenario as it seemed to bug out like this after some changes I made in code a while ago.. before that it was displaying in interface builder just fine!

There should be two prototype collectionViewCells displaying on the view controller scene.

From my research it seems to be a documented visual bug but I have not yet found a solution to it.

No amount of 'cleaning/building' and closing and reopening the xcode project seems to fix this..