Looks like it happens only when I use an ampersand in the Download Plugin title field (other characters seem to be fine). Here is an error message I get:
"Waing: DOMDocumentFragment::appendXML(): Entity: line 1: parser error : xmlParseEntityRef: no name in .../wp-content/plugins/email-before-download/email-before-download.php on line 270"
Using & is not an option (though it does work), because my client wants to use the actual &.
Also, using ampersand on standard WP pages doesn't cause a problem...
If you could please help me with this. Thank you.