Campagnolo Record 10 speed rear derailleur, short cage and 13-26 cassete. New chain, new cassette.
Derailleur tensioner cog / cage jams against cassette between 26 and 23 (don't even think about pedalling backwards when you're in 23), "b" limit screw fully and properly adjusted, chain length/ tension perfect. Compact chainrings on the front.
Can I keep using this derailleur or do I need the medium cage and this problem will go away?
You don't say if this happens in the BIG ring, small ring or both. If it's just the big ring I'd suspect there isn't enough chain length.
Cross chaining is unnecessary and bad for your drivetrain. I never go more than one cog past the center of my cassette opposite the chainring I use.
http://www.parktool.com/repair/readhowto.asp?id=26
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