Created Unassigned: ModalPopExtender Problem [27995]

Up until now I had been using Ajax Toolkit v.v4.0.30319. The ModalPopupExtender had worked as expected.

I just installed v15.1.4. I just started a new project and am having the following issue with this control.

Setup up as follows:

<ajaxToolkit:ModalPopupExtender
ID="InfoModal"
TargetControlID="hidForOpen"
runat="server"
CancelControlID="hidForClose"
DropShadow="true"
PopupControlID="pnlUser"
BackgroundCssClass="ModalPopupBG">
</ajaxToolkit:ModalPopupExtender>

This worked great on v.4

This happens consistently. Works great three times by clicking a button and running InfoModal.Show(). Closing by clicking another button.

On 4th click to open the Modal Popup opens up in the background and is disabled...also opens up behind the panel that is in front. I can tell this by repositioning the ModalPopup.

Does this consistently every time.

I removed v15.1.4 and went back to v4 and problem went away.