Hi !
Up for this thread... I have the same problem with a TXT file.
The TXT file is not open out of ZP, i have verified the administrator privileges on this file, the read only, etc...
This TXT file contain all mail adress and password like EMAIL
ASSWORD
And in ZennoMaker and ZennoPoster (with SAVE FILE and LEAVE EMPTY FILE enable), and with Processing table with FIRST LINE and REMOVE AFTER GETTING enable, the first line will be don't delete.
I have see this error on many templates, and sometimes, when ZennoPoster want, all is ok... and the line is delete... ?!