I just got the 1.5.3 update via GOG, and when I loaded my savegame I noted that all my farm plots appeared to have lost their fertilizer. I plowed everything down and re-hoed the plot, then tried applying fertilizer again. It played the sound when the fertilizer was placed, and I can't place anymore fertilizer on that square, but there's no fertilizer graphic. Near as I can tell, the fertilizer is there, it's just not displaying the overlay. Could be a mod I had while playing 1.5.2 a few minutes ago, as I haven't bothered to start a fresh game with no mods to test, but I figured I'd ping the forum to see if anyone else is seeing this behavior.