I am having the same issue.
Randomly, at boot, the taskbar is just a gray bar with nothing on it. Nothing else happens.
If I CTRL+ALT+DEL and log out, then log back in, it comes back.
It happens about 25% of the time or so. I've never seen it happen twice (after logging out and back in) so might be a race condition of some sort with something else launching at startup.
I'm running Windows 11 Pro 22H2, build 22621.2070.
My installation is two days old, so I have barely anything else installed. I don't what Groupy is - I don't have that installed.
This was happening before I reinstalled my system as well, but I didn't report it, because lots of "fun" stuff was happening. (my previous OS install went 8 years and 3 upgrades without a reinstall, so it was over due for a clean slate...)
I've never had similar issues with the two previous generations of this product.
If there is anything I can do or provide to help debug the issue, please let me know.