jquery radio cannot change after 1st selection!

Question

I have the following stucture:

#main.accordion()
    h4#header1
        <table><tbody><tr><td>
        <input type=radio name=1_1 value=1 id=1_1><label for='1_1'>1</label>
        <input type=radio name=1_1 value=2 id=1_2><label for='1_2'>2</label>
    <ul>some text</ul>

With several h4 headers of similar structure.

When I click on the radio accordion opens and checks the value I clicked on. (correct)

However, any subsequent click on the radio will have no effect, the originally selected value stays. (incorrect!)

Putting alert() on radio .click() shows, that the newly clicked radio is briefly checked, but the selection goes to the originally one once the dialog is closed. ?!

Please help :(