Custom boats sink in editor since update

[six_ten 208]

All of my custom boats now sink in the editor.  They haven't changed, and they worked fine before.  Now when I place one it sinks through the water and the terrain, and vanishes.  Boats in previously saved missions sink as soon as I load the mission in editor.  If I am the driver when I start the mission the boat is underwater and rises to the surface and sails fine. 

 

Not sure whether it was APEX or the last ARMA update, or something else that broke this but can anyone offer a fix?

[road runner 4344]

When was the last time you used them? as there hasn't been an update recently.