Something very similar is happening to me;
Pressing CTRL R when PDN window is maximized and also another window is maximized – the resize dialog is partially visible.
When pressing Esc key then resizing window to less than full screen and trying again does not create error (all OK)
CTRL SHIFT R works OK in maximized window.
To reproduce:
Open an image in PDN, Maximize window of any other application, maximize PDN window, Click CTRL R
(My screen resolution is 1680x1050)