Big Sur - Messages not starting

Messages won't start anymore, it tries to start (icon jumping) for long time and after that it just freezes and comes unresponsive. Is there workaround to kick it up alive again?
when i try to run messages in macOS Big Sur, The application hangs and
doesn't respond, I checked terminal when trying to open the exe file and
recieve the following error:

Invalid absolute dimension, must be > 0.0. NOTE: This will be a hard-assert soon, please update your call site.
Laurmac nailed it in this post:

https://developer.apple.com/forums/thread/652842?answerId=658366022#658366022

... hold down the option key while clicking Messages in the Dock. It seems to me to be related to the Messages window trying to come up but the coordinates are off and the app is offscreen, but the app is depending on isVisible in order to complete the process of launching. That would do exactly what we are seeing.

This was a recommended fix from Apple... my guess is that all the workarounds we're finding are enough to reset the x/y coordinates of the window so that it comes up onscreen and visible. 🙃
This happens to me. For some odd reason, if I open Calendar first, then Messages will open. Otherwise, Messages just won't respond or open. Very strange.
This worked right up for me.
I wonder what's causing the issue.
Mac OS 11.2.3 (not beta)

This is still an issue in the public release, did anyone find a solution? Restart fixes it but it comes back regularly and is hella annoying.

Broke for me after the update to Big Sur 11.4. Tried every fix in this thread to no avail, about to jump on Apple Support. My message icon shows an incoming text, but when I try and open Messages on my Macbook Pro it bombs out with "Messages Quit Unexpectedly."

I was getting same issue and was on chat with an apple technical support executive who gave me this solution. Try resetting your password for Apple ID and also reconnect or update your apple 2FA devices.

https://support.apple.com/en-gb/HT204915

The token to authenticate and give access to these services with Apple get expired and reseting password or refreshing the device for 2FA clears / refreshes it.

It took me less than 10 minutes to do all the points to solve this with support team. Hope this helps resolve the login, auth issue.

Big Sur - Messages not starting
 
 
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