when you get to the manual screen try switching to maidumptool, closing it and then reopen it and see if the dump starts

 

i had an issue with one of my games too, try closing maidumptool and seeing if the game still loads on its own because maidumptool alters it temperarily i think but if it crashes or doesnt work sometimes it messes the game up or atleast it did for me.

but it may also be a game it doesnt support yet. Have you tried dumping it with Vitamin?