Seems like when I add a frame hold (freeze frame), I can add a couple of keyframes to the beginning of the clip (opacity 100% down to 30%, for example). BUT, I cannot then add any keyframes at the end to bring it back up to 100%. I have to cut the track into two clips, bring the opacity of the second clip up to 100%, then add a cross dissolve between the two. Have seen this bug reported elsewheres, so am thinking it's not just me! (Premiere Pro CC 2018, since 14.5 "isn't compatible...") Thanks.