Can't click and drag to select multiple keyframes.

Hey everybody, so I worked with an Adobe Support representitive for a few hours yesterday and we could not get it figured out.  The good news is that is was a project-specific issue.  So none of my other projects, or even sequences, are messed up.  the issue will remain a mystery however, and If you ever find the solution to this problem, this thread will be a good place to post the answer.  Take care, thanks to all who showed interest in this probelm! 

If you wish to connect further, you can find me on YouTube, Twitch, and Instagram all under the name "Tart Tizzle"  

Thanks again, cheers.

If resetting the preferences 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

Take some screenshots to show us what is happening in your Effect Controls panel.

Have you tried resetting Premiere?

When Premiere is acting up:

FAQ: How to reset (trash) preferences.

Can you share the screen recording of the same...ideally you should be able to all the keyframes by click and drag in the effects controls. However, you can try to select all the keyframes by just clicking on the property name you're animating and it should select all the keyframes.