Steps to Reproduce:
1. open acrobat DC
2. create a PDF from file.
3. save file
4. check the original file to see if it has retained it's format and is properly openable.

Environment:
OS: Windows 10
CPU: Intel i5 6600k @4.3GHz
RAM: 16gb(2x8gb) G-skill Trident-z @3000MHz
Motherboard: Gigabyte G1 gaming 5

Acrobat Version: 2015.023.20070

Expected result:
Doing this should bring up a new save dialogue, or the save-as dialogue technically. Then once it is saved it should switch to that file.

Observed Result:
Doing this overwrote the original file w/o providing a save dialogue.

I have attached the ruined file and a SysInfo Report from acrobat.

This may be a bug. I use InDesign to create an very important annual booklet. I export it to PDF and then break it apart and convert to WORD so that I can send individual sections to contributors so they can make edits for new year's book. In April, I had no problems and I have done this for 8 years now. See attached. We received an update and now, as of July, when I convert the same document, the formatting is all messed up. For me to get a good version to my contributors it would take me hours to clean it up. If I send it to them as PDF, they cannot make online edits because most do not have professional Acrobat. One thing I did notice that is different in the new version, when you select to save as WORD, the version options say WORD or WORD 97-2003. In the previous version before the update, the choices were WORD or WORD 97-2004. I always chose the 97-2004 version because it did the conversion cleaner. Now I cannot use either version. I need some serious help because this is a very important book for our County. I have no option to get an editable copy to my contributors now. Please help me!!!! I have attached the April version, the July version and the original PDF that the two WORD versions are drawn from. I am using MAC with Sierra version and the PDF is 2017 .009.20058 and WORD is Version 15.36 for 2017

I've got some text layers 95% opacity with drop shadow applied on Illustrator. Those Ai files are linked into a Indesign doc, exported as PDF but when I view the artworks on Adobe Acrobat Pro DC (version attached) there is a white box around the text. This only happens on Adobe Acrobat. If I use Mac Preview it looks fine. I can only fix the issue if I make the text layer 100% opacity in Illustrator. This bug only happens when the doc is viewed on any zooms that are 100% or less. It looks fine on 125% or over (see files 'wrong'/'right' attached)...

German, as we know, is a language with some very long words. Therefore it is very common that words will be automatically split across lines, using what we used to call a "soft" hyphen. When exporting a PDF in German to a Word document, this "soft" hyphen is not distinguished from a "hard" hyphen (i.e. one which is produced by a key-stroke (as in the hyphen used just then).
I was asked yesterday to "Compare" a revised document in German (submitted as a pdf) with a former version in Word, and submit an estimate for updating the English translation. The straight conversion using Adobe Acrobat produced an almost continuous red line when "Compared". Because every "soft" hyphen had been transformed into a "hard" hyphen plus space and hence a change was flagged.
I started a "Replace" running, and accepted/rejected for each hyphen and after half an hour realised that my estimating the job was likely to take as long as doing it. Frustrated, I gave up and had some dinner. Got up very early this morning (Tuesday) with this realisation:
Most "-[space]" in German texts were originally soft hyphens.
The main exceptions to this are "-[space]und", "-[space]oder" and "-[space]bzw."
Once I had this in mind, I searched and replaced each of these exceptions with an unlikely key, deleted all "-[space] and then replaced the unlikely key with the original. It was almost 100% successful.
I don't, of course, know how Acrobat works (I'm 65 and my entire experience with data processing has been tentative) - but I think it's an algorithm based on the appearance of the text and then a best match (rather than dealing with the ideas of "soft" or "hard" hyphens). But it seriously messes up the result.
So, I offer my ideas for your further research. I think it will hugely improve the conversion of German in particular.
If it works, you can thank me in the nicest way you can think of :).
Denise

This is about both editing and exporting PDFs.
The attached PDF has an explicit explanation of the issues + screenshots. Text from the attached file goes right here.

I’ve got Adobe Acrobat Pro DC 2015 Release Version 2015.006.30355.

On Web page https://www.zm.gov.lv/mezi/statiskas-lapas/nozares-informacija/buklets-meza-nozare-latvija-?nid=1088#jump
..there is a link to a PDF file "Latvia's Forests During 20 Years of Independence" 2010, https://www.zm.gov.lv/public/ck/files/ZM/mezhi/buklets/MN_20_EN.pdf
The PDF file seems to be a nicely composed PDF with Adobe InDesign CS5.5 (7.5.2).
The font used, Museo Slab is a publicly available font, I bet it should not have any major issues.

In the said file, page 47 there are multiple issues with a context having a ligature ffi in the source text ‘office’. This is the only occurrence in the file containing the word ‘office’.

1. When Copy/Paste is applied from Acrobat Pro to Notepad++ with the regular Select tool, I get C2 8A UTF-8 bytes which is shown as [VTS] in Notepad++.

No ‘office’.

2. With Text Edit tool (Tools > Edit PDF > Edit) I cannot select the entire word. Only starting from the second letter. I try to do selection both with mouse and with SHIFT+keyboard arrows. No way to select the first letter. BUT as for the remaining letters, I get all the components of the ligature as correct letters in the output with Copy/Paste to Notepad++:

Just ‘ffice’ of ‘office’.
But this shows that there is facility to get normal text from ligatures, however it is not implemented correctly or not at all in all the tools and scenarios making them all buggy. Why can I not select the leading ‘o’?

3. Also, when exported to HTML, the ligature gets encoded as C2 8A in UTF-8.

The same as for Copy/Paste.

If the routine which allows copying ffi from the edit tool was applied to Select and Export tools, some of the Acrobat Pro bugs would be fixed.

I have several other bugs in my list. If this makes sense for Adobe, please confirm, and I will keep posting. Moreover, I hope these will be fixed asap. These bugs are there since at least v9.

I can see certain documents were created in MS Word with simple follow on/flowing text and standard paragraph styles ie no **** text boxes. Even with the export options turned off, Acrobat does this incredibly annoying export to text boxes where it is simply run-on (flowing) text. You then have to extract the text, box by box to get the document to be in an editable form. Even exporting to rtf has similar issues. Exporting to plain text means you have to format.

In the end, you waste valuable time either extracting the text or having to reformat the text to get something that's useful