In previous versions (up through 1.7.4, and 1.8 snapshots through 14w05b), a Comparator would read and output a signal from a Minecart with Chest/Hopper if the cart was on a Detector Rail, even if the rail was sloped.
Starting with 14w06a, this no longer works if the cart is on a sloped detector rail, unless it is on the very bottom end of the rail. This behavior can be seen in the attached pictures (the lower, sideways comparator; ignore the higher one).
This breaks several redstone contraptions, including many automatic cart loaders.
Is this still a concern in the current Minecraft version Minecraft 1.7.8 and Snapshot 14w11b or later? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.