I have a VB.NET based Web application that has numerous controls in an update panel - Buttons, dropdownlists, and textboxes.
If I use any control other then a textbox to do a postback, I have no problems. If I use a textbox with the textchanged event as the event, I always get a Javascript error.
It is site wide, and not tied to a specific page. I have put a dummy button control on the page that has no code but just does a postback, and when using it upon entering the form before using a textbox, the page runs flawlessly until I start over with the form.
Any ideas?