>I made an application to be run on a touchscreen monitor.
>It consists on some buttons with a label placed over them
>
>what if strange is that if I place them over an Image object and want to swap the image.picture i have a annoying flickering of the labels.
>They flashed as the background picture changes.
>
>I tryed with lockscreen but without success.
>
>The buttons are placed over the screen object just like the image object.
>What can it be ?

I had a similar problem -- it has to do with the load of the different images and not so much the labels. I solved this by adding hidden (visible=False) images with the image file loaded, Then set the image to display from these preloaded images.