how did you type the addresses to the field?

I have had similar problems but.the error was my input (copypasted the whole list). one address at the time and press enter after each address

e: this could be reported as a bug if it hasn't already been done. does someone have time for it?

if you use semicolon [ ; ], sending will fail. when you press enter, there appears semicolon and line change. so if you write an address + semicolon + space + another address, it will look like it is ok (similar to the input with enter) but probably fail.