When I reply a thread using IE11 or Chrome in Windows 7, I always get an error "changes made in the editor will be lost. Are you sure you want to leave this page?". Is there any settings I need to change before I can reply successfully? I can only reply to a thread using iPhone or iMac. Please kindly advise. Thanks a lot.
Try Mozilla Firefox (Firefox Web browser — Trusted, Flexible, Fast — Committed to you, your privacy and an open Web — Mozilla). That's a strange error as it seems the browser thinks you're trying to leave the edit window.