I see why the new witness list is not saved, it'll be fixed in the next version.
In the meantime, I updated the main hub to enable catchup with old witness lists. Your wallet should start syncing if you open it again.
No new version of the wallet available yet? The wallet is being updated and I can already see some Obytes in the wallet, as well as other tokens such as Silentnotary and Titan Coin, but unfortunately I don't see any Blackbytes yet.
However, the wallet synchronises very slowly despite a fast fibre optic connection and when the CPU is not under load, could it be that I am not connected to all witnesses?
No idea where the syntax error comes from, maybe the backup is corrupt. You can install an older version of the wallet from
https://github.com/byteball/obyte-gui-wallet/releases released at about the same time when the backup was made, and try to restore into that version. Before installing an old version, make sure you uninstall the current one and rename the data folder to get it out of the way.
I will only try if I have no more Blackbytes, but after successful synchronisation I will immediately create a full backup again.