SUDDENLY something simple is different

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

@Steve Zeeeee,

> I used to just drag imported clips to timeline to create sequences. Now nothing.

How do i make a film if i cannot fill the timeline? Some missed setting?''

Working for me. What version are you running?

Drag to the new icon. Or right-click, New sequence from clip.

> Also when i use the PPro dialogue to create a sequence or show, it goes the folder containing many folders of films i want to make, but it NEVER can go to the folder of the film clips to create a project? It just shows a symbol of some image.

See this post:

https://community.adobe.com/t5/premiere-pro-discussions/video-files-not-read-if-there-is-a-dng-file-in-the-same-folder/m-p/14216027#M527107

But, as I said in the next post, using Right-click Project Panel -> Import doesn't have the issue.

Stan