Changed PDF files since latest update

Have you installed and run any "cleaning", "optimizing", "speed-up", anti-virus or VPN apps on your Mac?

Give this a try: boot into Safe Mode according to How to use safe mode on your Mac and test to see if the problem persists. Reboot normally and test again.

NOTE 1: Safe Mode boot can take up to 3 - 5 minutes as it's doing the following; 

• Verifies your startup disk and attempts to repair directory issues, if needed

• Loads only required kernel extensions (prevents 3rd party kernel/extensions from loading)

• Prevents Startup Items and Login Items from opening automatically

• Disables user-installed fonts 

• Deletes font caches, kernel cache, and other system cache files

NOTE 2: if you have a wireless keyboard with rechargeable batteries connect it with its charging cable before booting into Safe Mode. This makes it act as a wired keyboard as will insure a successful boot into Safe Mode.

By the way I've been unable to duplicate your problem with a Mac Mini running Sequoia 15.2.

0 - had had exact same blurry effect as pictured

1 - migrated Xmas day from 12" MacLap to Pro M4 (doesn't have to be Xmas day BTW)

2 - 12" included Firefox already

3 - opened blurry PDF on M4 with Firefox - looks fine

4 - used print function Save to PDF - can take quite a few minutes

5- opened the newly added PDF file with Macos Preview this time - looks fine - new file is a few 100 MBs

Hope this helps!

98pointfix

carolfrompuna wrote:

I am experiencing the exact same thing discussed here, unfortunately no one seems to have a fix.

VikingOSX found the free Adobe Acrobat Reader will render the PDFs correctly.

See: Preview is Inverting a PDF - Apple Community

Can you post a screenshot of what you're experiencing so we can get on the same page?

Old Toad wrote:

By the way I've been unable to duplicate your problem with a Mac Mini running Sequoia 15.2.

Did you look over the thread I linked? At least 4 people including myself can reproduce the problem with Sequoia 15.2

carolfrompuna wrote:

I am experiencing the exact same thing discussed here, unfortunately no one seems to have a fix.

There's no new info as yet. It does seem to only affect PDFs from the Internet Archive.

See the link I posted for some additional info from Greg.