TP 9: after restart extended config was resettet

Hi,

i'm using TP9 for a while. After a crash i have to "reinstall" a clean version and reintegrate the mailaccounts. But now, external pictures (better the button "load external.." won't show up in any received mail.

To get this feature back working i have to edit the extended config and set "permissions.default.image" from 2 to 1. After that everything works as expected. But if i close Thunderbird and start it again, it seems that the config file will be overwritten and i have to set that permission again after every restart.

Have i to edit a file manually for get this setting work over a restart?

Thanks for any hint