Hi Tom,
Thx for your reply, I found out that I have to select the edit. This only occurs when I have to put a dissolve at the end of a clip(mostly an audio dissolve at the end of the program).If I have to put a dissolve (video or audio) at the beginning or between two clips, i just can go there (prev edit)select nothing and press cmd+t or opt+cmd+t and it will also put a dissolve in.
Hope you can follow me 🙂
Lucien