Buying Trusts with Sparks

[Neozeru]

Thread Title: Buying Trusts with Sparks
Platform: Windows
ISP: Comcast
Type of Internet Connection: CATV
Internet Connection Speed: 5Mbit/s
Date & Time: 9:30 PM EST
Frequency: Always
Character Name: Stoutarow
Race: Galka
World: Siren
Main Job: Blue Mage
Support Job: Thief
Area and Coordinates: Bastok Markets E-11
Party or Solo: Party (3 Members) and Solo
NPC Name: Isakoth
Monster Name: None

Steps:

Interacted with the NPC "Isakoth".
Selected the option "Trust".
Two options appeared to buy Trusts.
Selected the option "Cipher of F. Coffin's alter ago. (500)"
Selected the option "Yes" to exchange 500 Sparks of Eminence for the Cipher.
Obtained the Cipher, however the window to continue buying items with Sparks does not reappear, nor does interaction end with the NPC Isakoth.
Forced the game to close and tried to buy the other Trust "Cipher of Gilgamesh's alter ego. (500)
Same result, stuck with no window prompt and continued interaction with the NPC.

[T_Metria]

I'm also having the same problem with the Eminence NPC in Windurst Woods on Asura

Buying Trusts with Sparks
Thread Title: Buying Trusts with Sparks
Platform: Windows
ISP: AT&T U-Verse
Type of Internet Connection: DSL
Internet Connection Speed: 5Mbit/s
Date & Time: 04January2016 @0945~ CST
Frequency: Always
Character Name: Tonnochi
Race: Mithra
World: Asura
Main Job: Dragoon
Support Job: White Mage
Area and Coordinates: Windurst Woods (J-10)
Party or Solo: Solo
NPC Name: Fhelm Jobeizat
Monster Name: None

Steps:
Interacted with the NPC "Fhelm Jobeizat".
Selected the option "Trust".
Two options appeared to buy Trusts.
Selected the option "Cipher of F. Coffin's alter ago. (500)"
Selected the option "Yes" to exchange 500 Sparks of Eminence for the Cipher.
Obtained the Cipher, however the window to continue buying items with Sparks does not reappear, nor does interaction end with the NPC Isakoth. - UI instance locks.
Forced the game to close and tried to buy the other Trust "Cipher of Gilgamesh's alter ego. (500)
Same result, stuck in instance lock, and continued interaction with the NPC.

[Folken]

It's a known issue:

http://www.playonline.com/ff11us/polnews/news24833.shtml