First, after installing Tribunal (not GotY edition), my wife noticed that the game would crash when she tried to write notes on the map.
Second, after resting several times, no DB assassin attacked.
We just installed Tribunal this morning, so I guess these might be resolved after a reboot later today.
As a side note, I've noticed several crashes involving Dwemer ruins, particularly Nchuleft (I believe - it's the one southwest of Tel Vos, north of an Ashlander camp). In that particular ruin, crashes seemed to happen whenever I turned a particular corner, but occasionally in other rooms. Eventually I just gave up and left. This was *before* we installed Tribunal.
Running MW on a brand-new machine, Win7, and so far it's been going perfectly apart from these issues. no patches or mods.
Ideas?