The Source button on the toolbar doesn’t take effect until after Foliovision
has already munged the HTML in the post, so that’s no help. Maybe
someome thought the Source button would be a good replacement for the
Wordpress per-post “Plain text editing” checkbox that doesn’t work with this
version. It isn’t.

There’s another problem that cropped up after I deactivated the new version:

In every post that had been edited with the new v2.0.0 Foliovision editor,
the text ceased to flow as it normally does.

With Foliovision activated:

For example, this was a normal paragraph that
flowed properly all the way to the right hand
margin before deinstalling Foliovision 2.0.0.

With Foliovision deactivated:

For example, this was a normal paragraph
that
flowed properly all the way to the right
hand
margin before deinstalling Foliovision
2.0.0.

But in the rest of the posts, that had NOT been edited by Foliovision, this
problem did not occur and their text still flowed normally.

As soon as I reactivated the Foliovsion plugin, this problem went away and
text in all the posts again flowed as it should.

If it helps in tracking this down, I still have a deactivated copy of the
TinyMCE Editor plugin, that has been installed (and deactivated) since
before I installed Foliovision 0.x. There’s been no change in its presence
or deactivated status during all of this.