For me it works for buys 🙂 I see errors in my logs such as "Invalid TP...". But I guess it depends on the position of the MA line relative to the current price. You may want to check that before modifying stops. Or you may try the Trailing Stop block, I think it is a little bit more clever and there was some option to follow such line.
I see some bug in the way input parameters are displayed now in the "Modify stops" block, I will check this later.