Chain jumping

The chain still keeps jumping off the inner ring on my Felt Z100, it's a triple chainring and have seen some "chain catcher/keepers" made by Dog Fang, Krex and others that work but apparently only with doubles, is anyone running one on a triple and if so, which one?
The tube on my bike is 31.8.
The tube on my bike is 31.8.
Cube Peloton Pro.
Genesis Core 30.
Genesis Core 30.
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I got mine from here http://www.billys.co.uk/english/group.php?prod=chng-js
Ordered it online and it was delivered the next day.
Nope, tried that, will keep fiddling with it and hopefully I'll get it sorted.
Genesis Core 30.
Genesis Core 30.
Genesis Core 30.
Does it do it consistently or is it just the odd time when changing gear (perhaps under full load) ??
Genesis Core 30.