I recognize too much of this from when Marxdarx was living with us. Unfortunately. I think part of the problem stemmed from the fact that the line between "working on 3D stuff at home" and "playing around on the computer all day" is rather ambiguous to the untrained observer, especially when 80% of the time when the untrained observer pokes her head in, there's a game or some random internet site open rather than the 3D program.
That is not a current issue, though, and it's still too recent for me to talk about the time period without bitterness. Honestly, he'd not have been more than a dubious roommate if not for the conflicts over the Little Fayoumis. I took my duties as a full-time aunt seriously, and I keep wanting to have been more.