I can't drag clips to timeline. All Source Patching is enabled, but still won't work. I can create a sequence from clip, but can't add additional clips and also timeline is uneditable (cannot move or delete clips) I ran into this before, and was able to fix by resetting my preferences, but cannot find what it was now, and don't see the original post that I followed... Help!
Press Alt (Windows) or Option (Mac OS) while launching Premiere Pro. You can release the Alt key or Option key when the splash screen appears. To reset preferences and plug-in cache at the same time, hold down Shift-Alt (Windows) or Shift-Option (Mac OS) while the application is starting.