Its been running fine for me the last day or two but I did get another server error when previewing a message I posted on OT:
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Exception Details: System.Web.HttpRequestValidationException: A potentially dangerous Request.Form value was detected from the client (message="...50 all-in-one = 20 watts, scan...").
Source Error: 
An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.  
Stack Trace: 
[HttpRequestValidationException (0x80004005): A potentially dangerous Request.Form value was detected from the client (message="...50 all-in-one = 20 watts, scan...").]
   System.Web.HttpRequest.ValidateString(String s, String valueName, String collectionName) +240
   System.Web.HttpRequest.ValidateNameValueCollection(NameValueCollection nvc, String collectionName) +99
   System.Web.HttpRequest.get_Form() +121
   System.Web.UI.Page.GetCollectionBasedOnMethod() +70
   System.Web.UI.Page.DeterminePostBackMode() +128
   System.Web.UI.Page.ProcessRequestMain() +2112
   System.Web.UI.Page.ProcessRequest() +218
   System.Web.UI.Page.ProcessRequest(HttpContext context) +18
   System.Web.CallHandlerExecutionStep.System.Web.HttpApplication+IExecutionStep.E
ecute() +179
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +87