I'm having a 'stair' problem..

Hi forum goers,

I ran some searches of the forum for threads talking about not being able to walk up stairs and I didn't find any conclusive information. Sorry if this has already been discussed, but I was hoping for some help if anyone knows anything about this.

I'm in Creative mode building a CV and I have some sets of stairs on either side of a landing. Both sets of stairs and the surrounding blocks are identical, they are built the exact same way; mirrored. I can walk up one side of the...

I'm having a 'stair' problem..