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Thanks,
I tried a bunch of different hotkeys, all with no luck... I think they are probably all pre-assigned already... or get key-repeat issues.
Is the mouse pointer/icon supposed to change in any way once you have the correct hotkey held down ?
Maybe try a dual key approach ?
giving up for now.

I see what may be happening, it sounds like you are selecting the triangle with the Mesh Editor as you say the whole triangle turns red. Try just opening the Mesh Tools window by itself, hold left alt key while left clicking on a triangle and you should see just a red outline. Then the transform buttons and sliders should work for you.

Thanks, I tried that. Holding left alt and clicking on cube does nothing. (well sometimes the MeshTools window minimizes itself and flashes yellow a few times.)
When I press left-alt  Unity's pan icon in top-left corner changes to a hand (while I have alt pressed)  maybe alt/right click is already used ?   I tried re-assigning to Control, but with no luck.

forgot to mention, I am on a macbook pro. sometimes these limited laptop keyboards can affect things ?
also tried this with Cube, Sphere, and some random mesh prefabs, all with mesh colliders.
Also tried in a fresh new project, with fresh import of Mesh Maker.
have also tried this with default mesh with mesh colliders, and by saving mesh out with your tools, then re-applying that one as the collision mesh. makes no difference.

tried most of the other tool options, and they all seem to do something (as I don't need to select any polygons)
Its just the UV edit one doesn't work, as I need to select a polygon(s) and I can't

Maybe add a display showing number of polygons selected, and the current object selected info (you already have this on the Mesh Editor Tool)
Maybe also add, buttons for select next/prev poly. All and none  ?

New bugs possibly:-
click double sided mesh button. Works, but is there an undo ?  if you click it a few more times, then you get a bunch of errors... I think it just keeps on exponentially expanding/doubling the mesh until it crashes (>650000 verts in one mesh)

In Editor mode. Hotkey-click  can't select multiple polygons, can only select 1 at a time
Shift-Right click drag, does a look around the scene (rotates camera)... it does not select multiple polygons.

Maybe these are all Mac specific issues ?   haven't tried all this on PC.

sorry for slow reply, super busy...
created a cube, removed box collider, added mesh collider, added a diffuse material.
clicked meshMaker button, selected triangle mode and selected a triangle, whole triangle turns red.
Next select mesh tools, open transform-textures tab, and slide sliders and buttons. nothing happens to the texture
didn't try in a new project yet though.

unrelated... I can't edit the UV's...
I select a triange... then try the texture editing tools and nothing happens, If I try the other tools... flip / invert etc....  those seem to work ok.
any thoughts ?
I've looked in the docs, but they just say you can edit UV's by selecting triangle then hitting the buttons..
help appreciated, thanks.

That did the trick, thanks !! 
Just had to save the mesh, then re-apply to the mesh and collider slots.

Updated to latest version, and the "in-unity" buttons are great. Nice improvement.

A "Save prefab", option would be perfect!  cheers also for the fast response !

also gotta remember to have the "update normals" checked or the lighting is broken after editing.

Thanks very much. I'll update to latest version in case I don't have that fix (my version is about a month old) and I'll use that save option !
Cheers !!

Hi Im using mash maker on mac, iOS build settings, unity pro 4.5.2f1
Tried simply editing a cube into a wedge shape to make a slanted roof. Then I copied the cube detached the top so I had separate objects for the roof and walls of the wedge and put a different material on each (stone, and roof tiles)
all seemed good so far.
I can make prefabs with them, all still seems good.
But when I run the scene the meshes disappear.
The object is there, it has the materials, but the mesh is set to 'none'.
How do I fix this please ?

addendum... I can make the prefab...  but if I drag prefab back into a test scene, or look at prefab model in the inspector, the meshes are already gone. Its like the meshes are temporary and are not saved anywhere permanent. Am I missing a step in model editing to save out the meshes ?