Levels effect weird behaviour
When I add the levels effect on a clip, sometimes it shows a keyframe on the beggining of the effect's timeline and then, even though the cursor is over this keyframe, I cannot edit the parameters unless I go one frame forward and then back to the keyframe.
Other times when I apply the effect it shows no keyframe at all, and then I have no trouble editing the parameters straight away.
And other times, when I apply the effect it shows two key frames, one on the beggining of the clip and one in the end.
Here's a video illustrating. The last time I add the levels effect on this video you can see that even though the cursor is over the keyframe at the beggining of the clip all the settings are greyed out, and I can only edit them moving the cursor and then going back over the keyframe.
Other issue that I have with levels is that sometimes I apply the effect and everything seems ok. But when I render the clip it shows up totally black. I go back to the timeline and find the settings to be different than what I had left, usually "white output" is set at "0". And things get settled when I set the parameter back.
It might be related to #765 (closed).