The builder does not remove the block when there should be air. He builds the structure fine, but he ignores air from the blueprint. I tested it with "excavate" on and off in the architect table.

@BiBaButze -Is this the same bug as #2247?

I don't think so. It is with normal vanilla block, like stone and dirt.

I made a test with only BC (6.2.0) and NEI , same result. The Builder irgnores the air from the plan.

Having the same problem... updated to 6.2.1.. building a rather large road section with a tunnel.. our tunnel doesn't get cleared anymore.. it did in 6.1.5..

It seems to be a more general problem than just the air blocks... it doesn't clear the entire area it is supposed to build in for me. Which means that it doesn't even place all the blocks that are in the pattern.
(Seared Stone from Tinker's Construct isn't getting placed properly, Quarried stone from Railcraft is...)

Also, the fact that it isn't clearing the "air" in the patterns now makes it useless when using it to build roads for example... You can't make the pattern so it clears "headroom" automatically, like you could before...

@Komoden: Now that's odd. I'm pretty sure I didn't touch the related code in 6.1.7-6.2.1. About what does and doesn't get placed, that got changed in 6.1.7 as I had to fix potential exploits.

@asiekierka Well something is definitely wrong with the air-block handling. Wether it's because of the way that blueprints are now saved, or wether it's the builder, i don't know...

What did you change in regards to the "placing" of blocks? (Seared Stone should be a solid block, just like cobble)

Was "excavate" on when you created the blueprint?

@Komoden - blocks are now added on a heuristic basis, any block which is not a tile entity should work, BUT some modders break it... i will have ways of listing who soon.

Seared Stone should work, but the air issue worries me a lot more

@psxlover Pretty sure it was... Just set up everything from scratch again to make sure, and it's still being weird.
@asiekierka Reset everything... setup architect table, made blueprint... still doesn't remove everything...
Also: shouldn't it still work it's way from one end to the other when using path markers?
BTW: we're using path markers, don't know if that makes any difference...

Link to a few screenshots: http://imgur.com/a/u7cST

Found it! Fixed it!

Awesome! look forward to get the fix!

Great, thanks!