jscript runtime error: 'this.nav.top.style' is null or not an object error

This means the client-side object has lost the reference to the DOM placeholder.

This happens if you try to use a control that has been disposed by calling .dispose() on the client side.

Let me know if this is not the case.

Dan,

As far as I am aware, there aren't any explicit ".dispose()" calls on the daypilot controls which are in use.

Dave

Dave-
1. What is the version of the DLL that you are using?
2. Is the control inside an UpdatePanel?

Dan,

I am using DayPilot.dll v8.1.3469.1..
Yes, I am using UpdatePanels throughout the application to provide a more fluid UX.

Dave

Dan,

Also: we are currently using IE8, .Net Framework 4.0 .. Plans are in place to go to IE11... Could that be a contributing factor?

Dave.

.. I also note that in Firefox Nightly, the errors are fewer.

When exactly does it happen? Is it during any specific action?

Dan,

Apologies, I can't be specific as I can't narrow things down..

I think that it is either with the Daypilot Menu control or the DayPilot Calendar control
I am using an Ajax Update Panel.. Could that be a part of the problem?

Thanks

Dave

I mean, does it happen on the initial page load or after some user action (clicking something....)?

The best thing would be if you were able to reproduce it using a simple standalone page... So I can reproduce the issue.

I'm also getting this on resizing the screen or scrolling.