I tried to remove a road-rail crossing across two tracks using the remove road tool, but the game just crashed. Reproduced it in a new game by building two rail tracks next to each other, then a six tile long road across those two (two road tiles, two crossing tiles, then two road tiles). I then used the remove road tool from the tile right next to the tracks on one side, to the tile right next to the tracks on the other side. Doing the same with a single tracked railroad works just fine.
I confirm this for the nightly build of r4423 (Win-SDL - r4424 must be self-built, right?), but it does not happen with r4419.
Looks like it's fixed in r4425. I was at least able to remove the crossings I had troubles removing. Thanks.