My premiere pro has been working fine but now all of a sudden when I open the effects tab it closes instantly as if I clicked close..

If a specific project, try creating a new project and import the old one into it.

Hi subie_ucc,

We’re sorry about the poor experience. Could you please confirm the exact version of Premiere you are using? Also, is this happening while working on a specific project or across all projects? If it’s with a specific project, have you tried resetting the workspace to see if it helps?

Thanks,
Sumeet