same thing:
2013-08-23 20:01 register: p…, magic: 70478 65554
2013-08-23 20:04 unregister p…
2013-08-23 20:04 register: p…, magic: 84482 36578
2013-08-23 20:04 startSession: 70478 65554 not found
so p… registered, got key 70…, unregistered, got key 84…, and then somebody (your mum) tried to connect with the old and meanwhile invalid key 70…
Are you sure the key that was displayed in the VSTC plugin was 70… when you told her the key (well, most probably) but most of all, that you didn’t do anything thereafter? mean to say, when your mum got the “not logged in” error, the 70… key was still displayed in the plugin, and that not magically 84… had appeared meanwhile??