I have not found either of the problems you mention. Although in all my projects, the Initial position of the advert is top left and then I move itif needed after the title screen.
I create an advert like this...
// Init and Create advert
if adsOn=true
setinneractivedetails(advertDetails)
createadvert(0,0,0,1) : // <--- Test mode is on
setadvertposition(0,0,90)
endif
And move the advert like this...
// Reposition advert
setadvertposition(0,89,100)
(I also change the size of the ad in these snippets, the initial size/position allows for a X close button top right of the screen, and then the ad changes to 100% width when moved to the bottom of the screen)
What platform are you experiencing these problems on? Is it Windows, Android, both or other?
And also what version of AppGameKit (and the player if you are using it) are you using? I remember having issues with the adverts at first because I was using the incorrect version of the player on my android device. (Although this obviously only affected android, It ran as expected on Windows)
I'm not sure about your second problem, perhaps if we could see some code maybe we could help more.
Hope that helps