Sorry if this has been fixed already, but occaisonally the Icon save dialog (this one) is sometimes hidden in the background.
Maybe its because I use keybord shorcuts to save? Obviously you can ALT+TAB to show the window. The first time this happended to me, I thought PDN crashed - I was waiting for a long time . I don't think this happens with the open dialog.
Also, when saving, if you click 'Cancel' on the Icon save dialog, the file will still be written... but as empty!
Lastly, a personal suggestion
Upon loading, maybe when you hold 'Shift', the largest image size will be loaded, bypassing the dialog? I don't know, might not be the best for everyone.
Great plugin, though! Extremely useful.
[using latest filetype plugin version from first post of this thread]
~ I love Paint.NET!!