Ronald,
  Vision Microsystems is in the process of moving from Washington state to Texas.  Their web site says that they'll be fully operational by the end of this month and it lists their new address and phone number.  In case you need it, the link is http://www.visionmicrosystems.com/ .
  I've always gotten excellent service from Vision and suspect that the delay in your response is related to their move.
  Skip Slater
  N540ES