[Spell] Problem with Force of Nature and Impale

[Fakuspakus]

I made new abilities based on those two, and they worked fine for a while.
But now whenever I summon treants, tree's just dissapear without death animation and Impale targets aren't airborn.

Mostly I just changed damage, and summoned unit type...

What could have happened here?

 

[The_Silent]

Changing buffs sometimes has weird effects like those descibed

 

[MN Lahmar]

It's a sound card issue. This thing happened to me before.
See this thread: Special effects at a point do not work