Erel,
I've tried Flurry's Eclipse sample, compiled the test app from Eclipse and tested it - I get the usage stats in my Flurry account (1 day delay). I've tested it from an emulator, so no real device is needed.
If i compile the app from B4A using flurry library, i don't get any stats. Tested on real device as well.
I've used Flurry_3.2.1.jar to compile B4A library using the code from your example. No errors, library compiles fine, i can use it from B4A, I can compile the test app, it runs without errors but no stats on flurry.com