No, we had some Cyren changes that made Cyren unstable in some cases. We will be releasing a minor today to address these issues. If you need a custom build you can contact sales@smartertools.com. We have a custom build from Monday or Tuesday that adds stability to the changes we made in the last minor.
I don't think it bad definition file, but if you want you can clear the definition files for Cyren,
"C:\Windows\Temp" and delete all files starting with "cteng_", Make sure Cyren is not running when you do this.
Matt Petty
Software Developer
SmarterTools Inc.
(877) 357-6278
www.smartertools.com