When I check out and enter a login/password to be remembered, the charge goes through (using the 411111111111111) visa card but when it's done I get"Object reference not set to an instance of an object." error.

This is what the Event Viewer has to say about it:

AssemblyVersion: 5.2.3
PortalID: 0
PortalName: Irrigator Nasal Spray
UserID: -1
UserName:
ActiveTabID: 40
ActiveTabName: Home
RawURL: /Home/tabid/40/ctl/Confirm/mid/389/Default.aspx
AbsoluteURL: /Default.aspx
AbsoluteURLReferrer: https://www.irrigatornasalspray.com/Home/tabid/40/ctl/Confirm/mid/389/Default.aspx
UserAgent: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US) AppleWebKit/532.5 (KHTML, like Gecko) Chrome/4.1.249.1064 Safari/532.5
DefaultDataProvider: DotNetNuke.Data.SqlDataProvider, DotNetNuke.SqlDataProvider
ExceptionGUID: 4982e30e-35ed-44a3-ac19-6e3ad1a904c6
InnerException: Object reference not set to an instance of an object.
FileName:
FileLineNumber: 0
FileColumnNumber: 0
Method: Smith.DNN.Modules.BuyNow.Confirm.ProcessStatus
StackTrace:
Message: DotNetNuke.Services.Exceptions.PageLoadException: Object reference not set to an instance of an object. ---> System.NullReferenceException: Object reference not set to an instance of an object. at Smith.DNN.Modules.BuyNow.Confirm.ProcessStatus(PaymentStatusInfo status) at Smith.DNN.Modules.BuyNow.Confirm.Submit() at Smith.DNN.Modules.BuyNow.Confirm.btnSubmit_Click(Object sender, EventArgs e) at System.Web.UI.ImageClickEventHandler.Invoke(Object sender, ImageClickEventArgs e) at System.Web.UI.WebControls.ImageButton.OnClick(ImageClickEventArgs e) at System.Web.UI.WebControls.ImageButton.RaisePostBackEvent(String eventArgument) at System.Web.UI.WebControls.ImageButton.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) at System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) at System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) --- End of inner exception stack trace ---

Of course it also creates the order but does not empty out the users cart so I expect that I will be getting some multiple orders...

If I don't enter the new userid and password, it works fine.

I don't have any sign-in page after the cart page, only the confirm page.

https://www.irrigatornasalspray.com/H...

So it's the Confirm control.

I will double check it again after I upgrade to 2.86.

I had the same bug. It seems to happen the first time you use the userid after registration. If you login a second time the issue went away. I look forward to 2.86 if that gets the problem to go away.