Same here - and it's early 2023... reported to support. but adobe closed the ticket with a link to this bug report.

This is a critical bug, and while other pdf-viewers show all comments immediately, adobe is not willing to fix the isssue.

Same as everyone else - marked corrections are not being implemented and everyone is wasting time and money!

If you also get an error code 135 when trying to save the problem file, this solution in the community discussion might help:

"This error generally occurs due to the incompatibility of settings between the version of Acrobat that created the pdf and the version of Acrobat that is being used to view the pdf. To resolve this issue just go to preferences, click on “General” tab, and then uncheck the “Save As optimizes for Fast Web View”."

I found that setting in preferences under “Documents,” not “General” (Acrobat Pro XI).

https://community.adobe.com/t5/acrobat-reader-discussions/error-135-when-i-want-to-save-the-document/td-p/9876360

I am having this issue still. in 2023 - when I'm working on a very urgent deadline and promise my clients it will be fixed quickly - and then I see over a hundred more comments that weren't there before - extremely frustrating and embarrassing. ON the phone with a colleague and we are both seeing a different amount of comments to the same pdf file.

I am having this same problem on my PC with comments from one client. This is extremely frustrating.

A follow up to my last message: I can replicate the issue by opening a PDF in Microsoft Edge, making a comment in Edge (which uses the PDFium engine), and then saving. Bam - comments from that point on will no longer display when you view them in adobe.

I just ran into this same problem, but thanks to having an abundance of files to work with, I've found a possible culprit. All of the comments that fail to load are tagged as having been made using PDFium - which is visible by using "export all to data file" on the comments of the documents.

Some data has been modified for length or privacy

Example comment that doesn't load
<</C[1 0.941177 0.4]/CA 1/Contents(montés sur ligne\n\nWe suggest to be consistent...)/F 4/PDFIUM_HasGeneratedAP true/Page 36/Popup 17 0 R/QuadPoints[94 183.25 146 183.25 94 173.25 146 173.25]/Rect[94 173.25 146 183.25]/Subtype/Highlight/Type/Annot>>

Example working comment
<</C[0.333333 0.278431 0.666667]/Contents(CNSC acceptable terminology...)/CreationDate(D:20220530153612-05'00')/F 24/IRT(d0521143-1e9e-41ae-b832-f4445aaffb7b)/M(D:20220530153612-05'00')/NM(03c2325f-0244-4617-a2a8-d1a72e166b89)/Page 12/RC(CNSC acceptable terminology...)/RT/R/Rect[0 0 0 0]/Subj(USERNAME)/Subtype/Text/T(USERNAME)/Type/Annot>>

I am having the same issue with Acrobat, but it has only happened recently, with one particular client's marked up PDF files. Marked up PDFs that I've gotten from other clients are still showing all comments right away upon opening. So, what is special about those files that is causing the difference?

Incidentally , if I open those PDFs in Apple Preview, I can see all the comments without having to scroll through each page.

I'm running Build 22.2.20212.0 on Mac OS Monterey.

We are seeing the same result in multiple installations of Acrobat Pro Version 2022.003.20263 on Windows 10 Pro version 21H2
Missed required edits in a customer commented file. This makes us look bad, because of a bug in Acrobat !

If you can't assign resources to this issue that has been reported for over a year, roll the application back to a version that works!
A broken function is more important than adding a new feature !!

We are an inhouse production department with thousands of products in 29 languages and our primary mode of product edit delivery from translators and editors all over the world is via marked-up pdfs. We have had this errant comment count happen multiple times with multiple designers...I second Phill Watson's comments. This is bad business practice, but not surprising from Adobe.

This is insane. This problem has been raised 16 months ago. Surely Adobe will be liable for a class action law suit? You are costing us time, money and good will with our clients, you are damaging our businesses. I think if we were all to band together and sue Adobe we would win damages. It's disgusting that you have so little regard for your subscription paying customers.

Hi Emma,
Thank you for your feedback.
We do have an open bug for this issue which we are planning to fix in the upcoming releases.
We will update this thread once the concerned issue is fixed and released.
Thanks

Still having same issues as all these users. Even when I scrolled through hundred+ pages of a PDF not all the comments are guaranteed to show up. Running most up-to-date version of Acrobat Pro DC.

We just missed a whole round of edits as the comments didn't load at all for me and have already gone to print on a project with errors.

Agree with everyone below that this is embarrassing and makes our jobs so much harder than it should be!

What lunacy is this Adobe? Fix this **** right ******* now. You've made me look a fool for quoting 15 minutes to do three amends and I didn't realise there were 85.

Same here.... :(

Same thing is happeinging to me only seeing 113 comments but there are over 350 when i scroll through the pages

Is this intentional?! It is still happening, and I second what everyone else is saying, that it makes us look like idiots to our clients.

exact same issue as others - only a few comments are visible when opening the file.

We NOW know that when we start to scroll the pages other comments will appear but since it hasn't usually happened in our pdfs, we looked like we had missed a load of client changes

a ridiculous feature … and given how long this has been happening a fix is seriously overdue

Have the same issue, when will this be resolved?

We are having the exact same issue as others only 10 of the 97 comments are visible when opening the file. When we start to scroll the pages the rest of the comments appear.
This is effecting our productivity and quality. If we have a document with hundreds of pages we can no longer trust the information we see in the comments panel.
This needs to be fixed as soon as possible. Acrobat is our main tool used to display client and linguistic edits.