Neal, can I have you verify your timezone is configured correctly from webmail under User Settings>Account>Time Zone? Please also ensure the timezone is set accordingly on the server itself, and your client device. A lot of the time these kinds of issues can be explained by an incorrect setting saved somewhere causing the client offset to be skewed. Let me know what you're able to find out here :)
Kyle Kerst
IT Coordinator
SmarterTools Inc.
www.smartertools.com