#30 problems while moving rooms

I have had this problems both with 6.0.1 and 6.1.1
More often than not I am unable to move a room to
another place in a grid with simple dragging. Sometimes
it helps to use "select and drag" method. Sometimes
(rarely) it helps to save the map. Sometimes it is
impossible to move a room at all.
The other problem is moving a bunch of rooms. If there
are many exits in such a group, they tend to become
broken in strange ways. Some still point to old
destination, some to correct new one. Some two-way
exits get split and become two different routes.