GroundCover assistance

Could someone direct me / give me a nudge in the right direction in how to use the groundCover feature? Been trying for a couple of days to get this feature working to no avail.

Here's what I've tried:
Tried it on both "Terrain" and "Mega terrain"
Made sure that the GroundCover is listed right under the terrain according to this post: http://www.garagegames.com/mg/forums/result.thread.php?qt=73472 (although, this seems to have been fixed in 1.7.0.
Tried moving the terrain and groundcover to the root and not being in a seperate simgroup.
Named the different terrain blocks and made sure the groundcover points to the terrain I want to use it on.
Made sure that the billboards are in powers of 2.

Not sure what I'm doing wrong. Anyone have experience with the groundCover feature? I couldn't find any information about it here in the forums, TDN or in the help docs that come with TGEA.

Thank you,
Fredrik S
Affectworks


Here's the relevant .mis information (shortened to fit max characters)

new SimGroup(MegaTerrain) {
canSaveDynamicFields = "1";
Enabled = "1";

new TerrainBlock(1) {
canSaveDynamicFields = "1";
Enabled = "1";
position = "-1023.8 -1024 0";
rotation = "1 0 0 0";
scale = "1 1 1";
detailTexture = "scriptsAndAssets/data/terrains/details/detail1.png";
terrainFile = "scriptsAndAssets/data/missions/blankMission_megaterrain_0_08.ter";
squareSize = "4";
tile = "0";
detailDistance = "25";
detailScale = "256";
detailBrightness = "1";
texelsPerMeter = "8";
clipMapSizeLog2 = "10";
};

[other terrain blocks cut to fit character limit]

};
new GroundCover(ad) {
canSaveDynamicFields = "1";
Enabled = "1";
position = "-282.204 -186.68 400.512";
rotation = "1 0 0 0";
scale = "1 1 1";
windDirection = "1 0";
windGustLength = "20";
windGustFrequency = "0.5";
windGustStrength = "0.5";
windTurbulenceFrequency = "1.2";
windTurbulenceStrength = "0.125";
Radius = "200";
dissolveRadius = "50";
reflectScale = "0.25";
gridSize = "4";
zOffset = "0";
seed = "2";
terrain = "1";
maxElements = "2000";
billboardTexture = "scriptsAndAssets/data/foliage/Weed01.png";
maxBillboardTiltAngle = "90";
shapeCullRadius = "75";
lockFrustum = "0";
renderCells = "0";
noBillboards = "0";
noShapes = "0";
billboardUVs0 = "0 0 1 1";
shapeFilename0 = "scriptsAndAssets/data/shapes/rocks/rock1.dts";
layer0 = "1";
invertLayer0 = "0";
probability0 = "1";
sizeMin0 = "1";
sizeMax0 = "1";
sizeExponent0 = "1";
windScale0 = "1";
maxSlope0 = "0";
minElevation0 = "-99999";
maxElevation0 = "99999";
minClumpCount0 = "1";
maxClumpCount0 = "1";
clumpExponent0 = "1";
clumpRadius0 = "1";
billboardUVs1 = "0 0 1 1";

[the rest cut to fit character post limit]

};