Opening torrent or magnet causes 2nd instance of Vuze

[Squanto]

Java 1.8.0_51
 Oracle Corporation
SWT v4508, win32
Windows 7 v6.1, amd64
V5.6.2.0/4 az3

I recently had system problems and had to reinstalling Win7U and the latest Vuze.  When I click to open a torrent or magnet file, instead of opening in Vuze as was done in the past, a second instance of Vuze starts and then dies because you can't run 2 instances of Vuze at the same time.  I've searched FAQs etc. and all I can find is info on how to run a second instance of Vuze but that's not what I want.  I surmise this is a Windows setting problem?  But thought I'd ask here in case it's been seen before.  Thanks.

[pompeydigger]

Probably a conflict on port 6880. My solution is described here:-

http://forum.vuze.com/Thread-Opening-a-t...Vuze--2820