Steve, I've just read up on this and some of it chimes with my experience. Thanks for raising it! I've had a school day.
My experience was forgetting to shut off the fuel taps on my R10RS with 40mm Dellortos. The left hand pot filled with petrol and I got a hydraulic lock when starting. Luckily it didn't fire. Stupidly I tried a few times (not knowing what was going on - it felt like a flat battery). Then I twigged and slowly turned the engine over in 5th gear with the back wheel. I got it turning eventually (fuel leaking through the gaps in the piston rings I guess) and then hit the start button. A few miles of doggy running then it cleared and all good again. Perhaps fitting in-line filters might be a good idea after all.