with the latest version of potplayer i get a potplayer popup logo in the bottom right hand of my screen, which (from what i can gather) has been used for ads in some versions of potplayer, - i haven't gotten any ads so far, just the popup logo (ad placeholder?)... so i ended up uninstalling it (the latest version) and installed an older version without "_ads.exe" in the file name and so far i haven't seen the popup happen again....
In the C:\Program Files\DAUM\PotPlayer\Logos folder you'll find a potplayer.png file which is the logo. Delete it, problem solved. Why you can't edit this out in the preferences however is annoying.
Edit: Uz jste zakazali ten PotPlayer ve firewallu? Kazdopadne byste meli, s reklamama to zacalo byt znacne neduveryhodne.