Bonjour problem with Printopia.

I was using Printopia to print from my iPad over my home wireless network. I understand it uses Bonjour to communicte with the network and printers. It stopped working and am llooknig for ideas to get it going again. When I print, the printers show as available, but if any one is choosen, including "Send to Mac" i get a box that says it is contacting the printer then it either just hangs or returns a message that the printer is "off line", "cannot be found", or "not available".

I have reinstalled the newest version of Printopia and thier support folks think that Bonjour is dropping he ball somehow!