Same problem here:
25/06/2017 15:00pm :GMT -5
Server Name: [SA] Silute
Team Name: Mengele
Character Name: Asura
Bug Description : Can’t learn attributes

Game Control Mode :Keyboard
Same problem here:
25/06/2017 15:00pm :GMT -5
Server Name: [SA] Silute
Team Name: Mengele
Character Name: Asura
Bug Description : Can’t learn attributes

Game Control Mode :Keyboard
Same problem here. 
Does this happen if you have a token? Not a true solution, but it may help.
Me too
Date and Time:25/04/17 GMT 17:00
Server Name:[SA]Silute
Team Name:Desideria
Character Name:Midoriko
Bug Description : Can’t learn attributes
I’m also experiencing thew same problem. I’m still learning that None [Lv. 1] skill and it shows 99 minutes always. Can not learn new attribute nor cancel the learning process.
Server Name: EU Fedimian
Team Name: Ignal
Char Name: Gernst
I’m archer and have same problem.
Happened again.
Date and Time:25/04/17 GMT pm08:20
Server Name:[SA]Silute
Team Name:Desideria
Character Name:Midoriko
Bug Description : Can’t learn attributes
Steps to reproduce the issue :
1)learn passive
2)kit the game while learn passive
3)restart game
OBS: Sorry for my bad English xD
Same here as a Ranger.
Same here
Date and Time:26/04/17 GMT pm 00:48
Server Name:[SA]Silute
Team Name:Pochoco
Character Name:Etoh
Same here
Date and Time:26/04/17 GMT pm 1600
Server Name:[SEA] telsai
Team Name:TheBABAYAGAs
Character Name:BABAYAGA
Here is link to share that our dev.team members are trying their best to fix it out 
Same here.
I was upgrading my plate att and got this bug after the 30 min required (wasted 10k silver). Today, I was able to upgrade again, so I thought the problem was solved or whatever, so I tried the plate thing again (from lvl 14 to lvl 15) aannnd bugged again (and another 10k wasted). So yeah… 2 days without any upgrades + silver to the trash. Any thoughts? Compesation?
Date and Time: 26/04/17 UTC -3
Server Name: [SA]Silute
Team Name: Ragnakkor
Character Name: Elliria
same here SEA telslal
fiirichi fiatza
stick there for 2 days
how long does it take to fix???
Same here
Date and Time:27/04/17 GMT pm 08:48
Server Name:(SA) Silute
Team Name:Gunkan
Character Name:Eiko
Same Problem here
Server Name:(SA) Varena
Team Name: QiiQ
Character Name: XiiX
Same problem here
Server name : (EU) Fedimian
Team Name : MythosAND
Character name : Mythos
Thx.
Just for further data to pass along to the devs/producers:
How inconvenienced/frustrated are you?
0 voters
Same problem here
Server name : [SEA] Varena
Team Name : FyeNguyen
Character name : FyeOnce
Server Name: [SA] Silute
Team Name: NoobSlayer
Character Name: Darkness
Bug Description : Can’t learn attributes
Hello everyone,
Sorry for the inconvenience, but we’re still working on fixing the issue.
We can cancel it for you if you’d prefer just to cancel it and try to re-learn it. If you would prefer that, please send a ticket in via our support system and it should be canceled within 24 hours.