If the PDF file you're trying to work on in our app somehow looks blurry or has a checkered background instead of displaying the text, you can try several options.
First, keep the file open for a while to see if it loads in the end.
If it doesn't help, try opening this file in the Preview app - this is a standard macOS viewer that uses the same system component as our app:
If the file looks the same in the Preview app, the problem is file specific. We're sure that Apple is aware of such cases if any and a new macOS update might fix the problem - still, you may want to contact Apple Support to make sure your vote is added for the fix they have registered.
If the file looks good in the Preview app but doesn't load at all in PDF Expert, please contact us at rdsupport@readdle.com and, if possible, share the affected file with us - we're happy to help you personally. If the file's size is too big for sending it over email, you can upload it to any cloud storage service and share a link with us - e.g., you can use the WeTransfer service.
First, keep the app and the file open for some time to see if the file loads eventually.
Check if the file contains vector graphics. These are either diagrams and graphs or the text that doesn't look blurry or pixelated even if you zoom it in drastically. Such a file can also look like a checkered background - in this case, it means that the graphics are heavy and our app needs some time to load the content.
Try opening this PDF in the iBooks app - this is a standard iOS app that uses the same system component as we do:
If the file looks the same in this app, the problem is file specific. We're sure that Apple is aware of such cases if any and a new iOS update might fix the problem - still, you may want to contact Apple Support to make sure your vote is added for the fix they have registered.
If the file looks good in the iBooks app, but doesn't load at all in PDF Expert, please at rdsupport@readdle.com and, if possible, share the affected file with us - we're happy to help you personally. If the file's size is too big for sending it over email, you can upload it to any cloud storage service and share a link with us - e.g., you can use the WeTransfer service.