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Just a few comments about the shift return spring. Mine broke last fall and I combined the replacement with checking the torque on the crank end nut as recommended by CSC. I stared a thread on this procedure. The spring replacement was not difficult. Do pay attention to the suggestion to use a cold chisel to notch and unscrew two allen head bolts on the clutch cover that are blocked by the frame. And you'll need the spring and a new lock washer for the clutch basket nut.
When my spring broke, the shift lever suddenly got "floppy." It would not return to center on its own. You could manually lift it up, and then click through the gears with the engine off. But you could not shift effectively while riding. Your experience of driving for one "cycle" without problems makes me think perhaps you are not experiencing a broken shift return spring. But then I am not exactly sure what you mean by a cycle, how many times you shifted and into which gears etc.
Can the bike be clicked through gears with the engine off? If so, as other posters noted, I'd make sure the clutch adjustment is OK and that the clutch is releasing properly. Quick test is to put the bike into first with the engine off, pull the clutch lever in, and see if you can roll the bike. I have to pull the bike back hard several times while holding the clutch in to "break" the clutch plates free, but once this happens, I can push the bike around with relatively little resistance with the clutch lever pulled in.
Sorry if this is all pretty simplistic. I hope nothing more serious is going on with your bike.
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