I'm creating stairs with validation turned on and I'm running into a problem when I attempt to modify the stair after it is placed. I'm starting with a Steel Egress stairs, all default settings except for the height which is set to 1'-2". The stairs validate and I can place it in the model. When I attempt to modify the stair I can change the values in the stair properties dialog but none of the changes are applied to the stairs. I'm also using the default constraints to build the stairs. I can modify taller stairs, 1'-4" seems to be the bottom limit. Anything shorter than that fails to update and I don't see any error messages or validation checks.
In short, I can make a set of stairs but I can't edit that set of stairs later.
Any ideas about why this is happening?