The Unarmed Fighter Archetype is given the same weapon proficiencies as a monk by the tool. This is not correct:
An unarmed fighter is not proficient with medium armor, heavy armor, or shields. An unarmed fighter is proficient with all monk weapons, including exotic monk weapons.
As you can see, for armor it is listed that he loses some of the basic fighters proficiencies, for weapons that is not the case, so he should still have Martial Weapon Proficiency.
Also, Monk Weapon is a Special Quality posessed by a large variety of weapons. The Weapon Profs of the class monk are not called monk weapons anywhere in the system, so that is what is referred to by the term "monk weapons". I have no idea what the RAI on this is, but RAW the UF Archetype should have much more weapon profs than PCGen gives him.
of no importance for this issue
Wow, that was fast!
Is there any way to get the corrected datafiles other than waiting for the next release?
Though the fix did a work for most weapons, I seem to be very unlucky, since I wanted to use the Nine-Section-Whip, which is a Monk Weapon, but still not listed as one of the proficiencies
After a little research, it seems like all exotic Monk Weapons are missing, the martial weapons are now covered by the fighters Martial Weapon Proficiency
I've added the exotic monk weapons to the Weapon and Armor Proficiency ability for the Unarmed Fighter.
My previous add has been removed as it was not the issue. "Weapon and Armor Proficiency: was defined as a Special Ability was was being granted as a FEAT. I changed the Archetype so that the Special Ability was being granted and tested it. The issue has been resolved.