I found this - but don't totally understand it. I got lost at "type alt enter". I typed it but nothing happened.
If your Audio Clips are labeled "Busy", go to EDIT | SELECT | ALL, type ALT+ENTER, go to the Audio Files tab and click "Recompute Picture(s)"
There are 3 new INI variables in SONAR 6.2 and higher that are used by picture cache generation and display. You will need to search your hard drive for the following INI files then open them in Notepad to make the edits or add the new line:
This option creates extra background worker threads for the generation of wave pictures when you load a project. One worker thread is automatically created per CPU/core. Setting EnablePicCacheThreads=0 reverts back to only using a single thread for picture computation. If you are running a system with multiple CPU's or cores setting this to 1 can greatly speed up the computation of pictures. Notes: · These threads are only active while the picture is being computed. · This option is only applicable on multiprocessor/multicore systems.
This option allows waveform pictures to be computed in the background while audio playback is in progress. Most modern computers should be able to handle this load with no problems. Note that work is only done while new pictures are actually being computed - once the pictures are finished rendering there is no overhead.
This option enables progressive display of waveform pictures. When enabled you will see pictures being displayed in the clips view dynamically as they are being computed. The waveforms will update in the background when the application is idle. If the ComputePicturesWhilePlaying flag is set to 1, waveforms will continue being displayed progressively even while audio playback is in progress. This can save time waiting for a complete picture to be finished before you can see it.