Problem solved! In a nutshell:

First problem with the grey dot was a simple mistake of exporting selected patches and not all patches easy mistake to make!

Second problem, because of the...

No problem :)

Your first patch should definitely not be saving out as a dot! are you using the export all? If you go into your mari projects tab you can archive the scene and send it to me, i'll then be able to...

I'm running the latest service pack so it can't be that, the fact your tiles are splitting apart like that means there is probably something wrong with the displacement offset. Which makes me think...

Let me know if you managed to get it fixed. If not i'm standing by to work out why :)

David

Video should now be online, btw what you set the displacement setting to on the shader in Maya will have no effect on what you see in Maya this is just to help you visualize the displacement in Mari....

In a nutshell the patches in mari with no displacement should be 50% grey. The displacement textures alpha gain should be set to 1 and critically it's alpha offset should be set to -0.5

This will...

I'll record a short video now take me about half an hour, displacement can be a PITA so it's easier for me to record a short vid

BRB
David :)