Okay, it is a visual bug where the Improved Crit Feat bonus is not being displayed in a tool tip. It is displayed in the inventory details and you can follow it in the combat log so it is applied and all is wellish ;p
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Still testing but might this be a visual bug or bug bug ?
I was at Fred, random sword in pack and in hand showed the same base stats for crit range with and without improved critical slashing. Am I misunderstanding how this is supposed to work ?
As I read the patch notes I'm thinking the normal base crit for a long sword with no keen that shows 19-20, should be 17-20 with the +2 IC:Slashing:Longsword feat ??
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Does it start from 20 and if the item is already in the IC range you don't see a change, eg a no frills item is 20 for crit, a random gen item with same base shows 18-20 and since IC:Slashing:Longsword grant +2 from 20 and the random gen item is already 19-20 I won't see a change. I want to say that's not how it works but can see a bug waiting to happen ;p