I am running single dongle mode using a fresh copy of fastlane. All I did was enter the control channel and it populated right way. Each voice channel populated with channel number each time it carried voice. There is some decent traffic on my system so of course it will be faster.
If you know how to use Windows Snip with the delay setting (to be able to access menus) and want to post your tabs, (input, output, decoder & control) that would be good. If not, compare my tabs to yours. This is what's working here for me.
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The last 2 tabs (window & misc) really don't matter as they dont have anything to do with decoding.