I normally mix tracks midi and audio.
Since few days I cannot see the audio track (normally loaded and listened) but without any visual track.
I can only see a text "occupied" and the track appears empty.
Any suggestion?
Thanks
 

Hi, and welcome to this forum. It sounds like you have hidden your tracks. To open the Track Manager, press "H", and see if the audio tracks are unchecked. Hope it helps. 
All the best.

I think what your seeing is the English equivalent to "Busy" and no wave, just empty clips. This happens when audio clips are loading but may linger after they've loaded because the graphics card is lagging or your interface/soundcard isn't connected.
As long as you can still hear the track it usually doesn't affect anything but your eyes.

Thanks for your answers... but your suggestions don't work. I try to explain more (sorry... English is not my mothertongue language).
1) Until few days ago... everything was working and I mixed midi and audio tracks.
2) Now the audio tracks are loaded (I can hear them) but the waves don't appear on the screen. The audio track doesn't show the wave (busy) but the track sounds its content.
3) I don't suffer this problem with other audio software.
I really cannot understand what happens.
Thanks for your help

Try deleting all the files in the picture cache. The picture cache is the folder defined in Preferences > File > Audio Data "Picture Folder"

Maybe your TAKE LANES box is not checked to allow you to see them ?

Fantastic! I deleted more than 2.300 files and now I can see the audio track again!!!
Thanks a lot!

Do this often! ;-)

Those files are used to display the waves you see in the clips. So they should be deleted often or this will happen again.