problem with ae-gallery slideshow

[elementals]

hello again,

i am having a little issue with an ae-gallery when starting the slideshow. it appears on ff and ie, other browsers not tested.
after a random while running the slideshow (sometimes a few minutes, sometime nearly half an hour), a random picture get shown over the whole left side of the browser and no further navigation on the page is possible - the slideshow continuous to run in the back, halfly covered by the one image.
has anyone else ever seen such behaviour?

i am running cms ms 2.1.1, gallery 2.1.3, ae-gallery 1.2.7-1, php 5.6.8, on a windows server 2012 with iis

[elementals]

no one an idea?

[Rolf]

Have seen this before at one of my sites, but not sure which one and what I did (or did not do) to solve it...

[ So pretty much a useless answer ]

[velden]

I recently let your website open for a whole night, still running fine in the morning.

[another useless answer]

[PinkElephant]

I'm seeing it, more so on narrower screen widths.

Might be worth trying display:none; on .ae-preloads