Thanks for the extra info' JohnJR, that makes things clearer.
First, I can confirm that I get the same reaction as utnik when trying to edit your document with Scribus 1.4.6 on Windows 10 which is that I can double-click into various random text frames and edit the text as I would expect. As with utnik, I'm not having the problem you are getting. I have no idea why we can do what you cannot do with the same file. (One thought is that because you have a very long text frame chain it could be causing problems if your machine is slow or doesn't have much spare memory. It's probably not that, it's just off the top of my head.)
I also have no idea why you are having problems with attachments on the forum. All I can say is that the forum software is old and clunky (in my opinion) and should be replaced with something better. a.l.e has already been asking what people think about a change here: http://forums.scribus.net/index.php/topic,2328.0.html
I don't have many .DOCX files, and certainly none that would be good to test conversion to .ODT, but if there's a problem with the conversion in LibreOffice then that's really an issue for the LO team rather than it being a Scribus issue. From personal experience I know that comments give problems and images sometimes do but I've not had much problem with normal text, not that I use LO very much on a day-to-day basis.
I've just done a quick test with some sample text in an .ODT file, formatting with in-built and user-created paragraph styles. Importing the text into a Scribus text frame with "Automatic" as the importer brought most of the paragraph formatting with it just fine except for a font substitution. (An import with the importer as "OpenOffice Writer" seemed to ignore the formatting completely.)
Character formatting will not be imported, so if your text was formatted with character styles in LO - instead of paragraph styles - then you will lose that formatting. Also, any bold and italic formatting will be lost as Scribus uses the proper font variants where word processors generally don't (they manipulate the glyphs on-the-fly to create bold-ish and italic-ish versions).
So, I think the upshot is:
* Make sure the correct paragraph styles have been applied to the text in LO;
* Make sure that the conversion to .ODT was successful;
* Import the text using the "Automatic" importer.
One other tip: Split your text into chapters and import each chapter into a new text frame chain. You will find it much quicker and easier to make changes that way.