The .tplinfo file in default
should refer to the common templates - default_top, for instance, inherits from default, which inherits from common, so templates request in default_top will first look in default, then, if not found, in common.
Does the 'message_delete_all_confirm.html' file exist in the default template set? If not, I suggest you run the 1.2.2 upgrade script again, which should install any missing templates into default. You can also keep an eye open during the upgrade for possible errors installing the message_delete_all_confirm.html template - there may be a permission problem preventing the new template from being installed.
Jason Rhinelander
Gossamer Threads jason@gossamer-threads.com