This behavior just started occurring in the last week or so.  When I place a webtab on an asp.net form and run the project, the webtab does not render on the screen.  All other controls, standard asp.net controls as well as infragistics asp.net controls, all seem to render just fine, except the webtab.  When I use the developer tools in the chrome browser to look at the css settings, it shows the visibility property set to 'hidden'.  I can change it there and it will display.  I'm not sure how to figure out what is changing the visibility of the control and/or how to correct it.  Any ideas would be appreciated.

Dan