I am finding that if I delete a widget, it sometimes reappears a few minutes later in its former location. This happened with an LED widget just recently. Further, it seems to tie up any virtual pin it was attached to until it reappears and is deleted again. This slows debugging considerably. I haven’t found a way around this yet.
I haven’t seen a widget disappear and return yet, but I am running v2.5.4 and have a pin showing as busy with no usage in the app. I have destroyed my working app and spent all day yesterday going through code looking for anything else that could be tying the pin up. I haven’t found anything.