Snap tool not working no matter if I enable it or disable.

had a similar issue. I accidentally pressed a ctrl+shift (something) and it locked out my preview pane
If you right click on the program preview panel Theres an option thats says "Display mode" and then select Composite Video

For some reason Multi-Camera was selected and that disabled my ability to snap and edit through the panel. Move it back to Composite Video and you can edit freely

Hi, I had this problem recently too and was resolved here: https://community.adobe.com/t5/premiere-pro/cursor-problem/m-p/12157323#M355604

Thanks to Ann Bens: "If you have any nested audio in the timeline delete those or disable Show audio waveform.

See how that goes. This is windows only. Edited: and mac."

I recommend re-setting preferences.

With Premiere closed 

hold down shift/control/alt on Windows and click on the icon to open the app. Keep holding the keys and let your system make changes.

On Mac it's the same process but hold down shift/command/option.

Hope that this helps