As you can see from my simple example I do get it to render each frame in turn through a whole set...
You say you notice from my video that it only renders the first/last frames - BUT it
does render all of the frames in the order of the Scene tabs. Compare the SKP's Scene tabs, the Images folder's the 11 PNGs and the movie frames ???
I've never had this 'issue'...
Do you have the Step=1 and the Start and End Frame correctly selected with the others in between - note the order of the available frames is as they appear in the top Scene tabs in the SKP - note how they are not sorted into alphanumeric order but should take their order as arranged in the tabs. Also remember a scene has to be 'ticked' to be 'included in animation' in the Scene Manager in SUp, it then becomes available in the list of scenes.
Open and read the 'anim' CMD file with Notepad - does it include just twp scenes/images or are there more that it isn't processing - I suspect the former to be the case...
To make an animation in SUp you need several scenes to give a smooth effect - there are tools to make flight-paths and set scene tabs - see the SketchUcation forum and Smustard site for examples... Once you have the images assemble them into a movie using 'Windows Movie Maker' or similar tools...
If the model etc is not too big can you make a zip file of the SKP, OCS and the CMD files, and post or PM it so I can look at it/test it...
I can't see what is wrong from these descriptions - either with your approach to setting this up or perhaps the tool itself ???