Novasarius

Has anyone else had log in failures from attempting to share two accounts (one for me and my wife) on the same PC? The error reads as follows: Login failed. Sorry! We couldn't log you in. Please check to make sure you entered the right *username etc... From my PC I can log into both my SL account and log in as her online account and even purchase stuff on marketplace. Even with a version of Firestorm installed in a separate drive, the login fails. I've yet to try this with the native SL viewer. From her laptop I can log in as her, everything runs fine using the native SL viewer. How can I run both accounts in SL with 1 PC?