tried it again and I got this:(twice in a row)
Server Error in '/' Application.
Validation of viewstate MAC failed. If this application is hosted by a Web Farm or cluster, ensure that <machineKey> configuration specifies the same validationKey and validation algorithm. AutoGenerate cannot be used in a cluster.
http://go.microsoft.com/fwlink/?LinkID=314055Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.Web.HttpException: Validation of viewstate MAC failed. If this application is hosted by a Web Farm or cluster, ensure that <machineKey> configuration specifies the same validationKey and validation algorithm. AutoGenerate cannot be used in a cluster.
http://go.microsoft.com/fwlink/?LinkID=314055Source Error:
[No relevant source lines]
Source File: c:\Windows\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files\root\26676eb7\92c7e946\App_Web_mpbs1z42.0.cs Line: 0
Stack Trace:
[ViewStateException: Invalid viewstate.
Client IP: 173.245.50.112
Port: 18931
Referer:
https://www.atomic-trade.com/account/register Path: /account/register
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2.13) Gecko/20101203 Firefox/3.6.13
ViewState: q+50r4Y9RyTckqxy/zHqfejrZ66FxDk3Qjdibvg+ES/UoZKOiYCwF+iUaOg0XdZA4/odDbh1ylEowcmBCSAKC97UoEO8ArJxx1/rZ8d40fJdLVe/kN5MmsvNBdcF028dMSFWDvCoF6v5B1L9QjggRrEbFgq3qLPdx9GZuxB1lENGDcgnHaH0IW3wABexIFkU/lZT/2/anfW0JoIqmTwwP5ySvmeA+bxEj8jtIGyPTN9GgYCE1N5AjkWIReuQWpZOVOk0dXysC/6o98x/f4loKxC7lX4lK3D0TxnZiNYqw85V0gZfV3se2hKtghiM5GFtFP9pZL+yQvjh0au4QAsmkuDQn/yihDjt4H/W5lAOjU58fevkLxWwANmKUY9YgYww]
[HttpException (0x80004005): Validation of viewstate MAC failed. If this application is hosted by a Web Farm or cluster, ensure that <machineKey> configuration specifies the same validationKey and validation algorithm. AutoGenerate cannot be used in a cluster.
http://go.microsoft.com/fwlink/?LinkID=314055]
System.Web.UI.ViewStateException.ThrowError(Exception inner, String persistedState, String errorPageMessage, Boolean macValidationError) +156
System.Web.UI.ObjectStateFormatter.Deserialize(String inputString, Purpose purpose) +432
System.Web.UI.ObjectStateFormatter.System.Web.UI.IStateFormatter2.Deserialize(String serializedState, Purpose purpose) +8
System.Web.UI.Util.DeserializeWithAssert(IStateFormatter2 formatter, String serializedState, Purpose purpose) +40
System.Web.UI.HiddenFieldPageStatePersister.Load() +248
System.Web.UI.Page.LoadPageStateFromPersistenceMedium() +238
System.Web.UI.Page.LoadAllState() +36
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +6704
System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +245
System.Web.UI.Page.ProcessRequest() +72
System.Web.UI.Page.ProcessRequestWithNoAssert(HttpContext context) +21
System.Web.UI.Page.ProcessRequest(HttpContext context) +58
ASP.account_register_aspx.ProcessRequest(HttpContext context) in c:\Windows\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files\root\26676eb7\92c7e946\App_Web_mpbs1z42.0.cs:0
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.E
xecute() +341
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +69
Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.34009