You should be running 12.2.0
You're able to view them in Premiere, right? Try importing your Premiere Pro project into AE (using the command to import a Premiere Pro composition - that way it won't be using dynamic link).
If neither of those ideas work, what's changed between when it used to work and now? Have you updated anything on your computer or installed anything? Perhaps Quicktime got changed, perhaps you installed a third-party codec pack, or perhaps you installed some new game or software. If so, what?