Do you mean the bug that occurs when you don't have a microphone plugged in in Vista/Win 7?
The CS crashes when you attempt to edit responses on a machine using a Realtek audio chipset and haven't got mic plugged in.
I can confirm this error, as well. It can be duplicated on my machine just as you say, editing dialogue without a mic plugged in crashes CS immediately everytime.
Any nay-sayers saying they have such-and-such OS and they don't have this problem; that's awesome for you, but it doesn't mean the problem doesn't exist. It is a
very annoying problem until you figure out what's causing it. Just because you want to
edit dialogue doesn't mean you want to
record it right then and there, so it's not immediately obvious what causes the crash.
Anyhoo, it's a problem that they should definitely fix for TES V's CS, if Bethesda don't go the Sega/Creative Assembly route and stop supporting the mod scene (and continue the move in a more Console/profit margin-driven direction). If that ever happens, I'll just stop buying TES games just like I (and many other TW fans) stopped buying new Total War games. Thankfully/hopefully that doesn't seem to be in Beth's immediate future.
On the topic of sound, though - does anyone get that annoyingly persistent PC speaker "BEEP" every time you click on anything in CS? It sometimes a pain remembering what settings I have to turn off in my computer settings to mute it and last time I managed to mute the sound, it also muted the Oblivion in-game sound somehow, which could only be turned back on in Desktop options while an Oblivion instance was running (and Oblivion loves being ATL-TABbed, let me tell you).