Try resetting the preferences:
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.
- Do one of the following:
- Click the Workspace menu icon and select Reset to Saved Layout.
- Choose Window > Workspace > Reset to Saved Layout.
If that doesn’t work ,try updating or rolling back your graphics driver directly from the video card manufacturer’s site.
The action worked with me is :
Here is how you can reset the preferences:
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. Release the Shift-Alt keys or Shift-Option key when the splash screen appears.
If you don't see the list of your recent projects on the Welcome Screen the next time you launch Premiere Pro, the preferences were reset correctly.
but after that, premiere pro is not running smoothly, its hang & hold too much?