Unless something has gone catastrophically wrong, your accounts should still be loaded fine. It sounds like the Code/Signature values are still find as well, otherwise the game wouldn't have even loaded you in. Is this all the accounts or just a couple? If that's the case, ensure you didn't just lose them to the activity wipe. If that's not the case, please send me the broken account XML so I can take a look at it (in PM since that's sorta sensitive info).
And in regards to this:
(12-14-2018, 09:50 AM)ASimpleMan Wrote: If it ain't broke don't fix it
There were bugs with the old launcher that we couldn't fix because we didn't have editable source code (Design View). We could edit old features within a limited capacity but couldn't do any major fixes or feature additions. A rewrite was indeed necessary.