You must set the channels count  to 1 in the import dialog of PS and do not check "Interleaved", that's all.

A hint for the demo of GC1:
First export as 16bit raw. Then import and convert that in PS or another image software into 16bit tif.

About GeoControl2:
GeoControl2 is in developement. The next step will be to enable GeoControl to create close up "terrains", means cuts of the basic terrain, which fits seamlesssly into the basic terrain.
This will make it possible to get ultrarealistic details in the foreground, even sharp flows from a flowmap.
At time xpleet is correct, for close ups the details of only one 4096*4096 terrain are not enough and you get more or less smoothed and washed out details.

I have the german version, there it is written with "z"

no, I meant Vue5inf.

First I load the terrain as tga image into Vue. Then I changed the terrain from standard to prozedural.

Now a 4th. tab is visible, called "Proz", with which you can add a prozedural function to the height generation. I did this, with a fractal noise, modified to only add some detail and not overform the whole terrain.

Johannes Rosenberg
cajomi
-developer of GeoControl-

There will be a Mac version too, but it will take some time.

The licence key will work on both systems, so, who now buys the Windows version have not to pay extra for the Mac version.

Johannes Rosenber
-cajomi-

This problem occurs only, because the upload to shareit was not done as it should, and so on their server the wrong version still stayed.

Johannes
-cajomi-

For Carrara users there is a "Addtitional" folder inside GeoControl, which contains a standard scene for landscaping. It is build for seamless terrains.

The best is really to use this standard scene. Sun, haze and so on are done, also some shaders are added. It is optimized for the special seamless terrains of GeoControl. To get those, checke "seamless terrains" on the Terrain panel. Then export and import it.

A second "Sundown" scene is added.

GeoControl has a special chapter in the help for Carrara users. Read this one.
And at least, use the presets deliverd (filter presets).

Johannes Rosenberg
-cajomi-

Yes, there is trouble with the key, send by shareit. They do not work on weekend, so I have to wait till monday, to fix it.

So far, I send all keys per hand. But keep in mind: I am living in europe, so when you have day, I am going to sleep.

Johannes Rosenberg
-cajomi-

it is based on L-System algorithm, but with a very own approach. The well-known rules will not fit to the terrain generation. Sorry...

Attached Link: http://www.cajomi.de/GeoControl/geocontrol.htm

oh, good that to here, so I have not to work on that. Johannes

@Tunesy The windows are pop windows, with javascript. May be, you have disabled javascript? That is at all not so good, but I can not change it so fast.

well, Digital Canvas Guilde will build a DEM plugin for Version 2, with all important formats for importing real landscapes into GeoControl. May be, he will add the GeoTiff. Johannes

@bikermouse Oh, I do not use the Geotiff format. I use 32bit floats. So, what is Tiffer? May be, it would be good for a plugin? Johannes

the geosculpting of GeoControl is far better then greyscale manipulation. But in version 1 it is limited to natural changes, for example to terrace a part of the terrain, or to build a round hill landscape, with soft erosion traces and in another part of the same terrain a ridged mountain, with smooth and convincing rising out of the soft landscape. So the brush can manipulate the height, the slope, but also the general look, by changing the filters for the brushed part.