Acacia Trees Dissapear?

[Ebonightmare]

  Here lately, every so often when I start up Feral-Heart, I see no acacia trees, and when I walk over to a spot where I know one is, there isnt collision. This lasts for about a day or two, then its fine again. Is this a normal glitch? And how would I fix it, if possible?

[feralheartdog]

Did you modify any files?
Try un-installing then re-installing the game.

[Ebonightmare]

 I didn't really modify anything, except I put another map in the exports. The map I added to the exports had no other files such as sound or textures for a custom object or anything. It only had the fho and fhm files. As for uninstalling and reinstalling, I tryed that, the trees were there for a few hours, then I start FH up again and gone. They're still in private maps, but public ones such as Flourite Plains, no Acacia Trees.