The problem is with the effect BlindDown. After the competition of Ajax, it first shows the data without the effect and then with the effect, in a flicker.

This is suppose to be an error and I can't fix it. What is the problem?

First, I hide the render, then update the render Div, then hide the secondForm then at the end, I blindDown the render, it works perfectly!

But why? I had never told the render div to show.

I think you're just trying to do too much. If it's flickering then perhaps it's being shown, then removed for the effect to take place and the element to reappear.

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