Groups of water blocks falling through any distance at all do not update until the POV moves (quite) close by. A video showing this behaviour can be seen here:
https://docs.google.com/file/d/0B_DqKqLT946KajIxWnFjUHYxeFU/edit?usp=sharing
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More info: this time the redstone repeaters fail to upate at all, even whilst other parts of the scene animate normally. Interestingly, the water blocks update even at a (much more reasonable) distance, with the water 'flowing' continuously from those valves which are stuck open (because the repeaters won't update). This new behaviour is shown in the following video: https://docs.google.com/file/d/0B_DqKqLT946KUWJxVE1PYXJEc00/edit?usp=sharing
I cannot get this to repeat the earlier behaviour of groups of water blocks failing to update, thanks to the repeater problem. Just guessing here, but when large numbers of groups of animated items are involved, all this 'simultaneous' action tends to overwhelm MC's internal machinery perhaps? The cavern in these videos is huge and contains lots of critters, each of which is animated separately. As these seem to receive priority render-wise, possibly there's little left in reserve to animate lower-priority items such as user-created stuff. I'm just speculating here, me not knowing anything about Minecraft's (rather remarkable) internals.
As a test, I'm going to run this again with Difficulty set from 'Hard' to 'Peaceful,' to reduce the numbers of animated items (critters) and see if this makes any difference. On the flip side, the issue with falling groups of water blocks was a problem with Difficulty set to Hard as well, but now it's the repeaters giving me fits and not the water blocks, and so reducing the number of animated items may not make any difference. I'll let you know.
Yet more info: Seems the Difficulty is already set to 'Easy,' and yet there are Creepers and Endermen prowling about. As I understand it, these mobs are not supposed to be present (or at least, visible) in Difficulty: Easy?
You're right. Sorry, I'm still new at this game.
Changed Difficulty to Peaceful but no change: water behaves normally now but repeaters still locked up.
Your computer appears to be rendering Minecraft using an integrated graphics card ("Intel(R) HD Graphics Family"). It's going to struggle to keep up under the best of conditions. However, recent updates to Minecraft and Intel's drivers have greatly alleviated the problem. I suggest you update Java and your video drivers to the very latest versions.
Do you have a discrete graphics card? Your problem could be that your computer isn't configured to use it for Minecraft.
Is this still a concern in the current Minecraft version 1.7.2 / Launcher version 1.3.4 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.
This ticket is incomplete without the requested information, no response has been received within a reasonable time and we are assuming the issue has been resolved. If you are still experiencing this issue, we can reopen it at your request.
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