You can see my screenshot there. I have tried this with the latest svn version of Spark (link is also in that other thread). I have accepted a query in Spark and then transfered this request to the other agent. And my Spark window grayed out (see screenshot). Maybe this is a bug in 2.5.8. You can try the latest version to check this.
I dont quite understand what is happening on this screenshot. Are you running both agents on one computer? Maybe that’s the problem. Is it happening if you transfer a queue to another Spark agent on another PC?
So. I have tested this a little bit more on two PCs. There is a bug, but i cant say what is wrong for sure. I have filed this as SPARK-1087. But it probably won’t be fixed soon (if at all) as all the other Fastpath bugs (http://www.igniterealtime.org/community/docs/DOC-1876).
P.S. no need to send me private messages about this. If i once reply in a thread, i then monitor it automatically, and if i dont reply, then i had no time or no answer.