There is a bug in the "Convert to..." actions, by the looks.
I just tried converting to small caps and back again in Edit | Convert | ..., and it didn’t work properly the first time, then it did work. Then part of it didn’t work properly, but when I tried to replicate that, it did work aso I am not in a position to clarify what is going on!
There was a question about the SIZE throughout -- the small caps in most fonts are fake, of course. NW (like other programs) simply converts the lower case into caps and reduces the size to 75% (or thereabouts). When you convert back from small caps to lowercase, the size is not changed back. It should be.
There is also the Format | Remove Attributes ... command. When you have converted to small caps, the Remove Attributes command changes the type size back to the originals ... but leaves the type as caps.
There is also the Format | Character case | Display as ... command. That moves back and forth fine.
EXCEPT that neither process respects the capitalized initial letter of a sentence when you convert back to lowercase.
In the Display as ... situation, though, you can get back to your original with the capitalized initial (or other capitalization among lower case) by using the Remove Case Change Attribute in that sub-menu.
This stuff needs to be worked through again, I think. Martin explained once why the two different methods were available; I don't see it as necessary. I do see the need for a single tools that works a bit better than either.
Geoffrey Heard, Business Writer & Publisher
"Type & Layout: Are you communicating or just making pretty shapes" -- Revealed! The secrets of how you can use type and layout to turbocharge your messages in print. See the book at http://www.worsleypress.com