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Chain jams on higher gears

I have very little experience of mending a bike myself so I apologise if this is a stupid question.

I have just acquired a mountain bike, and changing between the lower (rear) gears works, although is a little "clunky." But if I go to the higher gears -6,7,8- the chain will jam after about 20 seconds, and the pedals will not budge forwards until I lift the chain off of the rear sprocket and replace it. When this happens, I can back pedal but with absolutely no tension. It's not so fun to sort this several times a journey, so I'd be most grateful if anybody has any advice!

(The previous owner says they did not have this problem, so it may be related to me knocking something when I replaced the rear inner tube).

need pictures from many different angles
Is the chain coming off of the smallest cog and getting jammed between it and the frame?
Wheelies don't pop themselves. (from a QBP fortune cookie)
Lemme add Rob sticking chain link Wink . BUT listen to the above first... Wink
Good maintenance to your Bike, can make it like the wheels are, true and smooth!

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