Hello Claire
It looks like you are having trouble previewing the first frame of a pinned layer or beyond in After Effects due to issues with puppet pinning, where changes to keyframes or other layers prevent AE from previewing AE. You may have tried several options, including restarting, emptying the cache, and letting it sit for a while, but none of them have been successful. Throwing out the pinning and redoing it has been your solution; however, while this first resolves the problem, it inevitably recurs. It would be worthwhile to seek out more assistance or support to troubleshoot the issue as you have tried a number of alternatives without success after trying these steps below
1. Update to the latest version of After Effects. Check if there are any available updates for After Effects and install them. This may fix the issue you are experiencing.
2. Check your computer’s performance. Make sure your computer meets the system requirements for After Effects. It is also recommended that you close other programs to free up memory and processing power.
3. Clear the cache. Clearing the cache may help resolve issues with playback or rendering. Go to Edit > Purge > All Memory & Disk Cache.
4. Disable multiprocessing. In After Effects, go to Preferences > Memory & Multiprocessing, and uncheck “Render Multiple Frames Simultaneously.”
5. Simplify the project. Try simplifying the project by removing any unnecessary layers or effects. This can help reduce the workload on After Effects and improve performance.
6. Try using the Pin Depth option. This can help resolve issues with Puppet Pin not rendering. Select the Puppet Pin layer, go to the Effect Controls panel, and select Pin Depth. Change the value to something other than 0.
7. Try using the Collapse Transformations option. This can help resolve issues with Puppet Pin not rendering.
8. Contact Adobe Support. If none of the above steps works
Kindly let me know if it helps
Thanks