Relevant lines from the error log:
1826: 10890.143 [FC] _FC_CreateFileStart (1, 100, 2081, 0)(0x2)
1827: 10890.181 [FC] ERROR _FC_CreateFileStart : Already Exist (0x2)(0x2)
1828: 10890.278 [FM] ERROR fmcNotifyCreateJob : FC_CreateFileStart (0x82110013)
1829: 10890.424 [STARTUP] startupErrorRequestChangeCBR (0x82110013)
1830: 10890.472 [STARTUP] startupErrorRequestChangeCBR : ErrorSend (119, SHUTDOWN)
...
1903: 10965.827 [MC] Disp Error : 70
If this error is caused by some setting saved in the ROM, I should be able to reproduce the error in QEMU. I'm not there yet with CF file I/O emulation, and neither with still image capture emulation, but both are doable, so I'll keep an eye on this issue.
Meanwhile, please PM me a recent copy of your ROM (after the error) and - if you still have one - an older copy (before the error). They can be found in ML/LOGS on your card.