iMessage (Stuck Downloading images)

Thanks for this.

After days of trial and error, I was able to solve this problem by doing two main things: 1. completely resetting imessage, and 2. resetting NVRAM.

Step 1: Resetting imessage: I logged out and completely exited the application. Then, I followed the instructions here and improvised further by clearing the entire folder ~/Library/Messages: WARNING: you will lose all your chat history/attachments/etc. Restart your computer and go straight to step 2.

Step 2: Resetting NVRAM: see here How to reset NVRAM on your Mac - Apple Support

I also did a hard reset on the iPhone.

Don't open messages until these steps are done.

Give this a shot and see if it helps you.

Same problem! Please keep us posted.

Had this problem for a couple weeks. Tried this and it worked for me. Thanks!