GameSave Manager

You can try manually extracting your data.
Simply open your .gsba file in your favourite archiving tool (7zip, WinRAR, WinZip, etc).

I'm afraid that there is no support for multiple accounts per "session". The only thing I can remotely think of that may help would be the Modify Variables option, but even that would require reconfiguring between accounts (not to mention no registry data would be detected under 'HKEY_CURR...

GameSave Manager utilises the schtasks.exe commandline tool (which is part of Windows).
Perhaps some changes were made to this and wasn't documented / I missed it?

You're likely using a previous 'scan result' listing, performing a full rescan should address this. With regards to your Red Dead Redemption 2's video settings not being changed, this is not caused by GameSave Manager. Outside of restoration tasks, GameSave Manager only reads data and never writes t...

While technically possible, it would drastically (and I really do mean drastically) affect performance of the scanner. The 3x branch isn't multi-threaded, so in short all 'tasks' are performed in the UI (user interface) thread which is partially why it's slow. I've toyed with this in the 4x branch o...