The audio track does not show waves and has a dark green colour. How can I make the waves reappear; I had them in previous projects; I do not know what has changed. A user reported the same problem one year ago and no answer was given. I cannot edit without seeing those waves.
Have you checked that there is sound on your video? if the sound is too quiet, or not present, then it will show as a flat line. You could try applying a sound effect -> volume levelling to the track and also you can zoom in on the sound to see if there is a wave form there. I also saw a small sound wave when trying to import a MOV file from my Canon DSLR. To overcome this I have to convert the MOV into MP4 using VLC and choose for video MPEG4 and for sound MP3 or AAC. Camtasia does not navively support MOV files.