il taglia-incolla del testo da PDF produce simboli/caratteri casuali, non taglia il testo veramente

Hi Anand,

Thank you for the quick response. Here are the details you asked for, plus some important context that I think changes the diagnosis significantly.

MOST IMPORTANT DETAIL:
This is NOT a font issue with a specific PDF. The problem started suddenly on August 18-19, 2026, and now affects EVERY PDF I open, including files I had edited without any issue as recently as one week before. Files that copy-pasted correctly for the past 4 months suddenly stopped working, with no changes made to the files themselves. This points to a system/application-level issue rather than a font-embedding issue in individual documents.

SETUP DETAILS:
- App: Acrobat Pro desktop app (not web, not Edit PDF mode)
- Version: 26.001.21789 (64-bit), installed/updated on 18/08/2026
- OS: Windows 11
- Workflow: selecting text in a normal (non-scanned) PDF, copying it, and pasting into another application (e.g. Word). The text highlights/selects normally and appears to copy, but pasting produces garbled symbols or blank spaces instead of the correct text.
- Copying an IMAGE from the same PDF works perfectly - only text copy/paste is affected.
- This happens across MULTIPLE different PDF files, including ones that worked fine before 18/08/2026 - it is not isolated to one document.

WHAT I HAVE ALREADY TESTED AND RULED OUT:
1. Restarted the computer multiple times - no change
2. Tested on a colleague's laptop with the same Acrobat Pro version - copy/paste works fine there, so it is specific to my machine
3. Tested Acrobat on the web (browser version) on my own machine - after granting the browser's local font access permission, copy/paste worked correctly there. Only the desktop app is affected.
4. Checked Windows Update history - a Windows security update (KB5121003) and a Windows update (KB5120708) were installed on 18/08/2026, the same day as the Acrobat update. I uninstalled both as a test and restarted - the Acrobat text copy/paste problem persisted, so it does not appear to be caused by these specific Windows updates.
5. Checked Windows Event Viewer under Applications and Services Logs > Microsoft > Windows > Win32k > Operational for Event ID 260 (Untrusted Font Blocking) - no such events were logged, so font-loading is not being blocked by that Windows security feature.
6. Disabled Protected Mode and Enhanced Security in Preferences > Security (Enhanced) - no change.
7. Confirmed it is not a keyboard or general clipboard issue - copying images works fine, and other applications' copy/paste (outside Acrobat) work normally.

Given all of this, my current best guess is that the August 18, 2026 Acrobat update (26.001.21789) introduced a regression affecting text extraction/clipboard handling in the desktop app specifically, since:
- It affects all PDFs uniformly (not a single document's font issue)
- It started exactly when this version was installed
- The same PDFs work fine in Acrobat on the web and on another machine with the same Acrobat version but presumably an earlier build or different environment
- Images copy fine, meaning general clipboard functionality is not broken - only text extraction from PDFs

I will still check the items you requested (Document Properties > Fonts, and Preferences > Content Editing > Fallback font for Editing) and report back, but given that this affects previously-working files uniformly, I don't believe this is a font-embedding problem in the documents themselves.

Could you please check if there are any known issues reported for build 26.001.21789 related to text copy/paste, or advise on how to roll back to the previous Acrobat build while a fix is investigated? I was unable to find an official way to download a previous version of the Continuous track myself.

I need to resolve this urgently as it is blocking editing work on a product catalog.

Thank you for your help.

Best regards