I have tried it with paired Darts, paired rapiers, Rapier/Dagger and when using it with weapon finesse it just doesn't work. I get a -4/-8
Its infuriating since it's a stable to my favorite rogue build.

Two questions:
- Do you have the Two-Weapon Fighting feat? -4/-8 is the correct penalties for light weapon in off hand without it (https://www.d20pfsrd.com/feats/combat-feats/two-weapon-fighting-combat-final/).
- What version are you on? for 1.0.5 and 1.0.9c my character has the correct -2/-2 for light+two-weapon fighting feat.

Edit:
- The 1.0.9 changelog says " Finesse Training didn't work with Two Weapon Fighting. Resolution: fixed. "

can we get screenshots maybe? it works properly in my game. something like one showing feat taken and another showing martial tab from character sheet. it's hard to guess if you misclicked or misread something it only affected damage rolls for rogue class feat and for main hand only. that bug had nothing to do with AB.

That makes sense. My main isn't a rouge so I was passing on the note in case he is still on early version.

I't working fine for me...even the finesse training thing appears to be working correctly...you might make sure you don't have something active on the auto bar and or in the feat pop-up that is preempting it. had that happen a couple of times now. for example if you set charge to the auto bar it preempts "Everything" Else...the character just stands there and waith for a valid Charge Target.

lol yes I took the feat, and improved as well..

Here are screen shot (I am using the newest patch.)

Rapier/dagger
With weapon finesse and two weapon fighting. should be a -2/-2 att bonus. on my screen it says this:

Other:-4 main hand
and
Other:-8 for off hand

edit, ok well apparently I can't upload a screen shot..

But trust me when I say it's a bug, I did everything right.
Starting a new character now to see if it happens again.

Edit #2 apparently a new character does not have the bug...so I am stuck restarting or having him use a bow :/

EDIT# 3

Darts still dont work though, if you have two, you get a -4 -4 for some reason.
And to get darts you have to make fighters with wep focus dart as companions. Luckily I saved a game for experimentation like this.

https://imgur.com/upload for screenshots
2 weapon throwing I'm not sure. throwing weapons are pretty much absent in this game apart from alchemist bombs. it might very well not work.

Not sure about paizo and PF but dual throwing was explicitly forbidden in the origin game except for monks.and shuriken I think it has to do with how complex a weapon throwing action is...it combines Draaw. ready and attack in a single roll

Is your dexterity 15 or higher prior to the racial bonus, if not the TWF feat doesn't seem to work.

The game will sometimes let you select feats you can't use

Yes it is

Racial bonus shouldn't matter only the final raw score. I think hie Character is glitched. it works fine for me....Now that the Rouges finess training is fixed...Though the rouge I built while the bug was in effect is still bugged.