Do the seams of a floating floor ever have problems with popping out when you move furniture etc?

Not with moving normal stuff. Like any flooring it should be lifted if possible. It you do need to slide it get the special "pads" use use under the legs.

If your subfloor is flat and level there is less chance of it coming apart. And on occasion the less expensive laminates will not snap together properly or the locking system fails ( I heard stories that it happens on occasion) ..

And a tip.. Use a major brand name if possible. They have cheaper lines or some times a builders grade but the locking system is still the same..

Any questions you can e mail me through my avatar. GL