Internet Explorer shows my slides in the screen top left

hello community,

I have following problem.

When I publish a finnished e-learning from captivate 5 with adobe connect sometimes are the slides in the screen top left and not in the centre. We use Internet Explorer 8.

I use the project size 1024 x 576 pixels in captivate

Is this a  consciously problem? I don`t find anything about this problem.
Are there any settings I don`t know in connect/captivate ?

Thanks for support
stefaN

My settings

My problem:

Like

hello again, now I found the problem but I don`t know how I dissolve it. The problems are the widgets in my e-learning. With Widget the slide is in the screen top left, without Widget in the middle. But wh`? I am verry pleasure for answer stefaN