I'm having an issue where I can't craft anything from agricraft with some of the wood types that forestry adds. The wood types that gave me problems were Palm and Zebrawood but there might be more.

Which version of AgriCraft are we talking about?

1.5.0

Tried with Forestry 4.2.12.60 but I'm still intermittently having this issue.

Are these planks oredicted?

Yes, they are and they sometimes work. It's really weird so I tried with a client with only Agricraft and Forestry installed and still had the same problem, but the other day when I tested it again it worked so I tried going back to the client with more mods but the problem reappeared.

It seems this was a problem with Forestry and it's going to be fixed in a new version.
ForestryMC/ForestryMC#1127

Glad this was figured out, I had no idea what would be causing this.