Lands or artifacts that become creatures are not removed from combat if the creature making effect is removed during combat.

[LevelX2]

E.g. removing the Crusher Zendikon enchantment from a blocked land. Damage is dealt to the land in combat step, even if the land is no longer a creature.

506.4. A permanent is removed from combat if it leaves the battlefield, if its controller changes, if it phases out, if an effect specifically removes it from combat, if it's a planeswalker that's being attacked and stops being a planeswalker, or if it's an attacking or blocking creature that regenerates (see rule 701.12) or stops being a creature.

[LevelX2]

Related reports:
http://www.slightlymagic.net/forum/viewtopic.php?f=70&t=15336&p=162982#p162885
http://www.slightlymagic.net/forum/viewtopic.php?f=70&t=17365&start=15#p181899

[LevelX2]

FIxed