Hi Ton
Thanks very much for this offer. But usually it is up to me to help, not opposite
I'm still in kinda emergency mode, but just an update: I had to hire a data rescue company since the HD with all the data was broken (the read-write-head of it vanished ... already after 17 years

) and got the most important part today. Allthough probably a little missplaced here, let me advertise for them ...
siecon-it.com/
... they made a really professional and successful job ... not really a bargain, but when it comes to rescue essential data, the priority is sure a different one ... grmbl ... that this happens to me ... the preacher of making backups
I'll need now a few days to setup all the vhosts (including my dev enviroment) again and then will have a very deep look into jOpenSimRegister where I suspect the cause of your issue.
Greetz
FoTo50