@DesignRealUK Thanks for the details. Go to After Effects Preferences > Import > disable Hardware accelerated decoding and clear media cache (Edit > Purge > All Memory & Disk Cache). Let us know how it goes. ^Nishu
@DesignRealUK Hi Richard, we're here to help. Could you share your system specifications (CPU, GPU, RAM, OS version)? Also, what's the version of Nvidia driver are you using? Let us know. Thanks. ^Nishu