Sorry to see you're experiencing this issue. A white screen showing in the Composition panel generally points to an issue with GPU drivers and/or hardware acceleration of the panels, so I have moved this report from the Bugs section to Discussions. Have you tried toggling on "Hardware Accelerate Composition, Layer, and Footage panels" in Preferences > Display?
Additionally, what are the full specs of your system (OS versions, CPU, RAM, etc)? This information is helpful for us on the forums to have a full picture of the environment where you are experiencing the problem.
You mentioned that you updated your GPU drivers; what version were you running previously and what version do you have now?
Thanks for reporting this issue and for any further information you can provide,
- John, After Effects Engineering Team