Automatic closing of the document

Hello, during the phase of selecting the text for the translation of a document, once the tool or the selection or modification of the text is selected, as soon as I click on the page the program closes automatically without giving any reason. This only happens on some pages of the document. Please kindly tell me why?
Best regards

Hi.
Would you send us a sample PDF and some instructions for how to replicate the issue? Please email them to support@iceni.com and we will investigate as soon as we have them.

Thanks.

Just sent.
thank you