I am having this problem also.
Error indicated on line 5 >>> "Missing argument 6 for WA_SecurityAssist_Definition()"
Line 5 reads: $WA_MailObject = WA_SecurityAssist_Definition("","","","","");
(only 5 parameters)
If I add a sixth blank parameter, everything works fine. Adding "Charset: UTF-8" to the Email Object tab does not change anything within the code on the page.
I'm on a Godaddy shared server and everything works fine when I use the six blank parameters, but I need to add the last parameter manually.