With Johan de Witt in Congress, I attempted to trade another Nation 100 Cigars for 1000 gold and they accepted. The only issues is that the gold appeared not to have been added to my account nor did the cigars leave my caravel.
I have the Log and a picture attached. The saved game has my Caravel directly next to New Amsterdam with 100 Cigars loaded. To replicate, try trading with New Amsterdam.
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FreeCol game version: 0.11.3 (Revision: [be09d9])
FreeCol protocol version: 0.1.6
Java vendor: Oracle Corporation
Java version: 1.8.0_40
Java WM name: Java HotSpot(TM) Client VM
Java WM vendor: Oracle Corporation
Java WM version: 25.40-b25
OS name: Windows 8.1
OS architecture: x86
OS version: 6.3
Compiled from [be09d9] with not-yet-committed JavaDoc changes to FontLibrary.java. See MR#22 for those.
Oops, it would appear I'm using the FreeCol Ruleset, so it's Niew Amsterdam. ;)
Quite unsurprising, trade remains pretty flakey. I will get to this soonish.
Should be fixed in git.848d9d6. Setting to Pending until next release.