error from latest.log : http://pastebin.com/FuWWizpZ

server using KCauldron 1.7.10-1420.104

buildcraft version: 6.4.16
compat version: 6.4.2
galacticraft version: 3.0.11.333

Note from the GC developers:

Thanks to @asiekierka for identifying the issue, and thanks to all who spotted it and contributed to this issue report.

The issue has been fixed in Galacticraft versions 411 and later. Earlier versions of Galacticraft must not use the "Sealed xxxx Pipe" blocks if BCCompat is loaded - sorry.

I apologise for the long time it has taken us to deal with this, I have taken time away from the project for personal reasons.

Better late than on another Minecraft version altogether. :-)

seems you are running a bukkit server, can you try to recreate this on a forge server?

Galacticraft is not checking for the presence of BuildCraftCompat, which overrides the TileGenericPipe registration.