Can not email(pdf) detail module of a grid application

Hello,
I can export a grid to PDF
I can email-PDF a grid (the grid is attached as PDF in the mail)
But when I go to the Grid detail then try to email (PDF or HTML) then the page stays open and nothing happen (See attachment STEP1)

When I click on the Exit button (to close the window) I realise that the process is running but never end (see attachment STEP2)
Can anyone assist me with that issue?