Description of problem:
In the kde4 versions, when you had solved a game (removed all blocks) then kmahjongg placed all blocks in reverse order you played, then did the play over and then stopped with just a plain background.
In the new plasma version, this replaying never stops (reverse order placing, replaying, again reverse order placing etc....) I gave up after four cycles and just closed the window.
Please report this bug upstream.
Bug 363699 created in kde bugtracking.
Copy from KDE bug 363699:
This is actually a feature now, not a bug.
To interrupt the animation, just hit New, Quit or whatever.