I saw various bugreports to do with abandoning colonies, I just abandoned a colony created by a surveyteam on one of my moons and get this error.
error 3420 in cmdDelete_Click :
generated by DAO.recordset
object in valid or no longer set
It won't be clicked away.
After a ctr-alt-del restart, the colony is abandoned as it should be, so probably not reproducable but it might hint at something.
Areyar
edit: confirming shipyard addtask button behaviour in 5.02, selecting (but not adding) a different shipyard task in the pulldown menu makes the button available again
add task: no job makes the button un-grey for a fraction of a second, but is not selectable.
AS far as I can tell, the button greyed out after adding a job (add slideway) to the SY when a ship was being built. The first retool job does not cause the greyout..