I just setup a session where I use a drum module with multiple outputs and setup some audio tracks to recieve the outputs.
So then I wanted to use some automation to turn up a send to have some echo on one clap, I create an empty clip on the track that has the clap, so I can draw in an event to turn up the echo send at the right time, took me a while to figure out why nothing happened, but finally figured out that even if you draw automation for the effect send to open, it does not do anything unless you manually turn the send up first, the automation can't open the send if it's turned down on the clips mixer, but that's not the bug, just a bit quirky.
Anyways..
After you create a clip like above with automation, and then delete the clip while the automation has the send turned all the way down, it stays that way, if you turn the send up manually nothing happens anymore, it's like it gets stuck like a note that didn't recieve a note off message if you know what I mean.
If you save and then reopen the send starts working again.