If you do post about this issue on the LM forum, see if you can duplicate it using the default 'cruciform'  or legacy trees. That will be the first thing the LM guys will think of: can you duplicate it with default scenery?  If you have Trees HD installed and you kept a backup of the default textures (as confirmed by the file date), you could temporarily disable the Trees HD confers dds texture file and paste in the default one, then check an area with a dense conifer forest.     [Edit