FM Advanced 18.104.22.1682
Hardware - not relevant
Workaround: Use FM 14
Working with a large database with many layouts, it is pretty much essential to type some characters into the search box to reduce the number of layouts listed. However in FM16 if you do this you cannot drag a layout to a new position. The only workaround I have found is to use FM14 which doesnt have this bug.
The attached simple database shows this problem. It has 5 layouts and they can be re-ordered in Manage Layouts. However if "c" is put into the search box the number of layouts reduces to 4 but they cannot be moved.