That's the pre-rendered section indication. It means you used Render Preview at some point and PD is showing you where those sections are currently located on your timeline. Pre-rendering is meant to speed up the preview performance and generally is harmless and you don't need to do anything about it.
Sometimes, however, the cached (pre-rendered) versions can interfere with more recent edits you've made, and the best thing to do is to delete the temp files.
Under the Settings menu, use the
Manually Delete button and select all temporary clips, delete them, and then create a new project and exit PD. This will ensure that none of your current projects will be in use when you restart PD. Now launch PD again, and make sure that there are no more temp files, then reopen your project, and the green line should be completely gone.
YouTube/optodata
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