Only tested in SMP.
What I expected to happen was...:
Running against an anvil (actually to jump on it 😃)
What actually happened was...:
I was pushed back and forward while running forward.
Steps to Reproduce:
1. Place an anvil (in front of a wall)
2. run against it.
3. Be pushed back. (Looks laggy and a bit like suffocating in the anvil).
Explanation of the bug in this video: http://www.youtube.com/watch?v=y1kon5Wax8I&feature=youtu.be
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Tested in Multiplayer there (1.4.3 pre-release)
Bug comfirmed : collision bug when running into the anvil (little knockback)
collision bug when : force walking into the anvil, then moving left or right -> being stuck with a spazzing knock back until we stop moving in that direction
Solo mode : seems to have no bug with collision.

Same thing happens for me on my Linux server with an OSX and Windows client. (1.4.3 Pre-release)

This will also happen in 1.4.4 pre-release.
Comfirmed.

Confirmed in Multiplayer, not happening in Singleplayer

I have seen this bug when walking into any non-solid block. Fences and doors can do the same thing.

I also have this problem, you'll start vibrate when walking into the long sides of them. So you can't pass by it walking against the long sides of them.

Confirmed in snapshot: 13w07a Multi-player.

1.5 as well.

I believe I have found a serious issue related to this bug. A quick search through the issue tracker revealed my worst fears: Anvils can be decorporealized at will. I have uploaded a series of four images describing the process.

Confirmed in 1.5 release and snapshot 13w11a.

Confirmed in 1.5.1 tough

Confirmed in 1.5.1, just tried it out on my flat world.

I think this is caused by unsynced width of anvil block in singleplayer and server files. Thus, playing in SP is ok, but server thinks that anvil is wider than client knows, pushing player back when updating his position. So the fix would probably be changing anvil's hitbox in server files.

This needs to be updated for 1.6.2 as it is still an issue.

Anvil and chest have exactly same hitbox bug.
Confirmed in 1.6.2 both with anvil and a chest.

Still happens in 1.7.2. Just make a simple cube hitbox like the old fence had.

Verified still happens on 1.7.4.

does this still happen in SMP in the 1.8 snapshots?

in 14w08a the push back effect is gone, but can still walk through anvils as shown in the screenshots, but that's maybe another issue.

The four screenshots I originally posted are invalid. The real cause is looking at an anvil facing the other direction, not turning. The hitboxes of all anvils is set to the last one you looked at. The same thing happens with double chests, but the difference isn't big enough to let you pass through completely, which if I'm not mistaken, makes this issue a duplicate.

Still an issue in 1.8.1-pre2.

Still happening in 1.8.2-pre1

Why is this not a duplicate of MC-1635?

I believe this is a duplicate of MC-1635.