Hello,
Thanks for your inquiry.
Since you are using the Free Spire.PDF, we recommend that you can download the latest commercial version (
Spire.PDF Pack(Hot Fix) Version:7.5.0) to have try as it is more stable and contains more bug fixes.
If the issue still occurs after trying, to help us investigate your issue more accurately and quickly, please provide your full test code and your input file which can reproduce your issue. You could send them to us (
[email protected]) via email. Thanks in advance.
Sincerely,
Brian
E-iceblue support team