ASP.Net 1.1 form not submitting on IE

We had this stubborn form that did not ant to submit when entering a value in the 1 textbox and pressing Enter. This is supposed to work!

After Googling a bit, I found the solution: just add another hidden HTML textbox to the page. This issue only occurs in IE when there is only 1 textbox control in the form.

You can confirm this behaviour by using Fiddler.

Credit to 4guysfromrolla.