Play button on premiere pro has become unresponsive when I try and STOP a sequence playing

[Arlo G]

Bizarre, since earlier this morning, the play button works to start playing back a sequence, but will not STOP playback. Driving me nuts. Anyone know what could be causing this? MacOS Big Sur on a Macbook pro. 

[Arlo G]

and it looks like it is in one film only. 

[Peru Bob]

Delete the Media Cache and Media Cache files:
https://community.adobe.com/t5/premiere-pro/faq-how-to-clear-your-media-cache-in-30-seconds-in-premi...

If that doesn't work,try resetting the preferences:
https://community.adobe.com/t5/premiere-pro/faq-how-to-reset-trash-preferences-in-premiere-pro/td-p/...

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 that doesn't work, try creating a new project and import the old one into it.

Also, please help us help you:
https://community.adobe.com/t5/premiere-pro/faq-what-information-should-i-provide-when-asking-a-ques...

[Arlo G]

Gosh, that was quick, thank you! 

Wasn't first thing. But I cut a little bit off a clip and then the proble seems to have resolved. Strange.