I've got a few reports of a crash in ntdll.dll, but it seems to only happen on a very few systems and on most of those systems the crash itself is also rare.
If you are one of the ones to actually experience this problem, it would be awesome if you could help me track it down! If you're on XP, Select Start->Run->drwtsn32 and set the crash dump type to full. Now, if the bug should occur in the game, open the crash log file (usually C:\Documents and Settings\All Users\Application Data\Microsoft\Dr Watson\drwtsn32.log) and post the information about the Saira crash here. The call stack should help me figure out what extension that actually causes this problem, once I know that I can inform its developer.