I upgraded to the latest and greatest Smartermail yesterday and ever since, Plus Addressing no longer works.  I checked everything.  I figured some setting got reset and got turned off but that doesn't seem to be a problem.  Just in case I turned Plus Addressing off and back on.  No luck.  I don't remember the version I was on but it may of been a year old so it was a big update.  What may be happening here???