I have checked mystic.dat and even put back the version from before they update (from the backup) and no change. Tried an older version of A47 mplc again no difference. I still see:
pi@dmz:/mystic $ ./mplc -t

Mystic MPL Compiler v1.12 A47 (Raspberry Pi/32 2021/12/13 09:19:43)
Copyright (C) 1997-2021 By James Coyle. All Rights Reserved.

Compiling: /mystic/themes/default/scripts/startup.mps Runtime error 216 at $00024A70
$00024A70
$00010634
$00010124

pi@dmz:/mystic $ diff -s /mystic/themes/default/scripts/startup.mps /nmystic/themes/default/scripts/startup.mps
Files /mystic/themes/default/scripts/startup.mps and /nmystic/themes/default/scripts/startup.mps are identical

so the file is there and correct for 12/13/2021 version as is the mplc
I'll check how the nmystic directory (full new install) works next.

... "No comment" is a comment.

--- Mystic BBS v1.12 A47 2021/12/13 (Raspberry Pi/32)
* Origin: Mystic Pi BBS bcw142.zapto.org:23 (21:1/145)

I have seen this same error on my windows install of mystic and found it to be corrupted file inside a message base , I some how got lucky and noticed it happened when i scanned for new message and noticed the lock up happened at the same scan point .



... I will Quell the Storm, and Ride the Thunder.

Sysop SolaRis
Error 1202 and Error 404 BBS !
FSXnet HuB 2 Tholian AdmiN !

--- Mystic BBS v1.12 A47 2021/06/28 (Windows/64)
* Origin: Error 1202 BBS (21:2/1202)

Was permissions! I used the owner from my AlphaTest which is not the same
on the Pi, fixed that and it's back to normal ;)
Usual dumb mistake, I realized when I went to chown on nmystic to make it work. Still always good to have backups on each upgrade.

...Oh, that's very different! Never mind. ;)

... As I said before, I never repeat myself

--- Mystic BBS v1.12 A47 2021/12/13 (Raspberry Pi/32)
* Origin: Mystic Pi BBS bcw142.zapto.org:23 (21:1/145)