It is Second Life at fault, showing people offline to each other while standing next to each other. IMs not getting through because it states someone is offline when they are clearly online.
This is happening to a lot of people and has been an issue on and off for months. Even my wife and I, in the same house on the same IP, see each other as offline and cannot send or receive IMs to each other.
With my friend, dancing next to me, we were both offline to each other until I sent an IM and then it suddenly changed her online status.
[01:56] Shivahn Snowfox: Hi ♥
[01:56] Second Life: Patouli Cross (patmahon7) is online.
[01:57] Patouli Cross (patmahon7): hi
[01:57] Shivahn Snowfox: Only just showed you online
[01:57] Patouli Cross (patmahon7): you too
[01:58] Shivahn Snowfox: yeah
[01:58] Patouli Cross (patmahon7): [01:57] Second Life: Shivahn Snowfox is online.
---------------------------------------------------------------------------------------------------------------------------------------
[02:03] cǟȶ вlυ (catalinablu): hugs :)
[02:03] Shivahn Snowfox: Hugs and hi :)
[02:03] Second Life: cǟȶ вlυ (catalinablu) is online.
[02:03] cǟȶ вlυ (catalinablu): hola
[02:03] Shivahn Snowfox: SL is playing up with online status
[02:04] cǟȶ вlυ (catalinablu): yeah happened a few times last couple of weeks
[02:04] Shivahn Snowfox: yeah
Been getting this error message too: