I really tried to google this first but I just didn't come up with exactly this issue. When I'm in the source window I can't clear in or out points they are greyed out and the keyboard shortcuts don't work. I also can't seem to just right click the timeline and clear all markers. I have to select each marker one by one and clear selected? This is so annoying.
Any ideas? Thanks in advance.
Editing, Error or problem, User interface or workspaces
If that doesn't work, try resetting the Workspaces: Reset a workspace Reset the current workspace to return to its original, saved layout of panels. 1. Do one of the following: • Click the Workspace menu icon and select Reset to Saved Layout. • Choose Window > Workspace > Reset to Saved Layout. from here: https://helpx.adobe.com/premiere-pro/using/workspaces.html
If that doesn't work, try Preferences > Audio Hardware and set Input to None.
If that doesn’t work, try updating or rolling back your graphics driver directly from the video card manufacturer’s site. If NVIDIA, do a clean install of the latest Studio Driver (NOT the Game Driver).
If that doesn't work, try creating a new project and import the old one into it.