Just realized that the log showed the following:
I'm guessing when I pressed the Tab, the following happened:
2021.11.17 18:00:33 An error has occured: Corrupted memory (216) 2021.11.17 18:00:33 Shutting down
Not that it helps much.
That version is a couple of years old so it might be beneficial to try one of the latest version. Its hard for me to remember if there was some specific issue in that version.
I just noticed the Downloads page on mysticbbs.com somehow got replaced by an older copy so its pointing to the version you have, instead of recommending the latest builds. My bad on that one!
You may be interested in starting from a more recent version here:
http://mysticbbs.com/downloads/prealpha/
... Oxymoron: Race walking
--- Mystic BBS v1.12 A47 2021/11/06 (Windows/32)
* Origin: Sector 7 * Mystic WHQ (1:129/215)