My timeline and its controls are freezing as soon as I start making any changes. When I start premiere and open a current project, the timeline will not appear, the panel will be just dark grey and I will then click on menu buttons then it will appear and then I start working, it will not take command from my mouse and it will freeze whenever I do something. It will only show the action when I press space bar and play. Its really annoying.
Error or problem, Freeze or hang, 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.
Ann and Bob's posts are spot on but there may be a quicker fix which sometimes helps when your trying to work on a project created in an earlier version of premiere. Rather than opening the project, create a new project and then import the old project. And sometimes the simplest solution is to just keep working in the previous version of premiere... One of the great things about premiere is that you can keep multiple versions of the application on the system...