You are absolutely right, my bad. I copied the last portion out without paying much attention, but it should be like this:
Stevol, when you click the WinButton at first, does another dialog box appear? Can you try to introduce a a few seconds wait before executing the next click if that is the case?
Code:
Browser("micclass:=Browser").Dialog("micclass:=Dialog").WinButton("regexpwndtitle:=si").ClickStevol, when you click the WinButton at first, does another dialog box appear? Can you try to introduce a a few seconds wait before executing the next click if that is the case?

