I'm not sure what the change was, but handling of fatal errors appears to have gotten much better in the past month.
I'm primarily using Visual Foxpro in Wine, and C0000005 errors happen in various places in both Windows and Wine when using Visual FoxPro. Up until recently, Wine would hang with the C5 and I'd have to kill it manually.
Now, Wine exits cleanly after I say "ok" to the C5 dialog box.