I'm inclined to suggest you contact Sonar's tech support people about this. However, before you do, may I suggest you ensure that you have applied all updates and patches to the version you have. It may (or may not) be something to do with the following, which is the only reference I can find at Microsoft. It may have been fixed, hence the suggestion to fully update first. http://support.microsoft.com/kb/221685 George. ________________________________ From: ddots-l-bounce@xxxxxxxxxxxxx [mailto:ddots-l-bounce@xxxxxxxxxxxxx] On Behalf Of Greg Brayton Sent: Sunday, September 23, 2007 5:31 PM To: ddots-l@xxxxxxxxxxxxx Subject: [ddots-l] Boy I could sure use some help with this fatal error. Error unhandled exception a fatal error has occured module: c:/program files back slash cakewalk backslash vstpluginsbackslashsfzbackslashsfz.dll exception code: c000005 address:0b521a27:04e2f4f0:04e2f564 as a result of this error sonar is about to exit abnormally. I've been getting this pretty often lately, since I've added the extra ram I believe. What do you all think? What the heck can I do? http://www.gbrayton.com