This is present in sierra build Build 20080318232331 onward including the latest (0325), but 20080306 still works.
Previously (as in 20080306 build) one can open or type sql in sql editor and select a connection from Connection drop
down list and execute the command, now the Connection can not be selected from the drop down list although the drop down
list shows the available connections. Therefore nothing can be executed using the Database on the Services panel, as
said, build 20080306003141 works perfectly, this is a regresion