Updated to latest release of Illustrator, opened a PDF to encounter the bug shown in attached screenshot.
Hasn't appeared in any other file.
Bug is related to text that appears missing at bottom of PDF (three lines worth is blank), and disappears when I zoom into 300%.
Please get in touch with us at any of the other support channels – https://helpx.adobe.com/support.html . Since this is not a generic issue that we can reproduce at our end, we will need someone to look into your machine to figure out what is going on here.
Ashutosh Chaturvedi | Sr. Quality Engineering Manager – Illustrator
Sarah Khan (Illustrator team) commented
Can you please share your system info with us. Go to Edit-> Preferences->Performance. Click on the System Info button, copy and paste the text.