Since the new ALLPlayer series 4.x skins define the appearance of the OSD panel and in existing skins the button for free image resizing was not visible. I did a quick update of the five standard skins: Cinematic, Cinematic HD Easy, New Cinematic and Standard.
Skins - SIZE button fix.zip
These are not new skins but only a fast update of old ones (other skins may be downloaded from Here).
You should extract them to the Skins folder; the question of whether to replace existing files should be answered Yes.