
However the original version i used (with just edited height in logo + main screen) did not show the red box.(not for my clients!)
and ofcourse not for me (it's not supposed to do that to start with).
This means it's either the height edits that screwed something up OR its something the client pc's i tested it on have in common.
From your own expirience it shows it happines more often.. this leads me to believe it's to do with something ALL client pc's have in common..
(as a trouble shooter you should follow this kind of logic right?

Now first thing that pops into my mind.. ALL pc's where x64 win 7
(which i guess is worth checking out.. unless you already tested that part).
If you want to digg deeper i can give you a full list and tests / logs of what exactly is on which pc - disabled and enabled features - When it stops working.
but like i mentioned above.. this effort - i don't really care to do unless it's "welcomed" sorta speak .. (so dropping this topic is also an option as in the end i solved it for my self by adding the UAC code that fits my need).