I was also having trouble with the latest wallet even though previous versions had worked fine and I found the only way to get it to work was to
uninstall all old versions (iguana, agama and komodo) from windows, making sure you delete all associated files and folders from your "ProgramFiles" folder.
Then
delete the "Agama", "iguana" & "Komodo" folders in "C:\Users\[YourUserName]\AppData\Roaming\". Then install the latest version of Agama (v0.2.0.22a-beta) using the windows installer.
After that I started Agama with KMD, REVS & JUMBLR in native mode and imported my passphrase from the ico and the blockchain downloaded and the wallet synced and I can see both my KMD and JUMBLR balances correctly now.

P.S. if you want to save some time downloading the blockchain again you can backup the "blocks" & "chainstate" folders and the "komodostate" file inside "C:\Users\[YourUserName]\AppData\Roaming\Komodo" and copy them back after the re-install, before you open Agama for the first time... that worked for me.
So just start installed Agama from new/fresh....it took me 5-7 hours to download all the blockchain from start to finished on the Native mode.
Where can download a separate blockchain to not download all of them?
How many blockchain weigh now?
The blockchain download size is just 1,97 GB.
You can follow my instructions if you want to download the Native mode...because currently the Basilisk mode is not working if you want to send coins.
Very, very, very slow network working.
Missing nodes on the network?
Not sure what problems with your computer...but mine is ok.
If you using the old Agama wallet...you should download the new wallet update here>>>
https://artifacts.supernet.org/latest/I've tried the latest versions of wallets (agama and komodo).
But the problem of synchronization is not where it's going.
The wallets of the other coins are working fine.
same here... synchronization is repeating... repeating... repeating...