Any one else have this issue? 

It's mainly a problem when i'm working in assemblies and I'm trying to mate some parts.

I'll go to select a face but the 'smart' dimension tool appears if there are edges somewhere in the remote vicinity and when I click it places a dimension. It's incredibly annoying as it pops up in milliseconds as I move the cursor over the edge/face I want to select and I find that I'm hovering around trying to find a part of the surface where the tool doesn't show up.

Instant 2d & 3d are turned off and i've been through the settings but can't find a way of stopping it.

Any help is greatly appreciated.