Sorry for reviving old thread but I've change oil on 6th of May with exact same oil as last year (Motul 5000 10w40 4T Semi-syn Oil 4L & HF204 Oil Filter), even same seller and same item on fleBay.
Last year my clutch was fine, had few instances when it was hard to switch gears, but would go away after few clutch presses.
So I've changed oil on Friday and rode on Sunday for about 40 miles. As engine got hot it was basically impossible to witch gears, I had to massage in every single shift with variation of clutch press and throttle.
Lets remove clutch cover and try to dissemble