So I was playing around in creative mode on single player with the latest dev version for 1.7.10 and came across a crash when you break a block above a garage door. Here's the crash log I got when I broke the block that was above a garage door.

http://pastebin.com/FuR5dBvc

Upon further investigation, appears to be a problem with breaking a block above the garage door while it's open. Crash is not present when you break a block above the garage door while it's closed. This is also present in the stable build as well.

Not really sure, as I can't reproduce it. The crash log doesn't match up with the lines in question so it's a little more difficult to determine where the problem is.

if it helps any the blocks were arranged like this:

X X X
X D X
X D X
X D X

Seems to only crash when it's arranged with blocks directly attached to the garage door

Also encountered it when they were arranged like this

X X X X X
X D D D X
X D D D X
X D D D X

Broke the left one, the center one, and finally the right one. Breaking the right one caused the crash. All this is only if the garage door is open so it's a rather odd bug.

Finally, it seems that it's only with Greatwood Planks and Silverwood Planks, both of them being items from Thaumcraft mod that is causing the crash as this does not happen with normal vanilla wood. Which is odd, perhaps that's the cause and it's an issue of mod compatibility.

Does that help you any in reproducing?

I've tried the first configuration you noted, removing blocks around the top, but it's still totally stable. I can't devote much time to testing right now as I'm totally bogged down, but let me know of any other details if you can think of any.

k, as I mentioned in my previous comment (Edited it in after doing more playing around). Issue seems to be greatwood planks and silverwood planks from the Thaumcraft mod. Haven't had it crash with any other block aside from those two. Those two planks act really weird anyways so I wouldn't worry about it. You can probably close it.

I'll look into it when I get time. Nothing obvious pops into my mind why they would crash, but they are "special" blocks, which up to this point seemed to be harmless.

EDIT: Was able to reproduce the crash. I noticed a graphical anomaly I should be able to correct -- it might be related to the crash.

I folded this fix into the 3.3.1 DEV R3 release on the website. Give it a shot and let me know if it resolves the issue for you.

It did resolve it. Thanks!