After Effects não envia projeto pra fila do Media Encoder

This used to happen to me sometimes, although not recently.  As Byron suggests it might be your computer, but some other things you can try:

• Delete the cache folder, not just clearing the cache
• Turn off Multi-Frame Rendering in preferences
• Open Media Encoder before sending the comp to it.
• Restart your computer
• Switch to software-render only in File > Project Settings, your GPU might be struggling.
• Navigate to your AE project inside Media Encoder
• Use the Render queue in AE to create an quicktime ProRes file instead, then convert it in AME

Definitivamente no se envía o se demora demasiado en enviarse? En equipos que no son tan modernos suele demorarse un poco y debes esperar un buen rato.