ISP:
Time Warner

Type of Internet Connection:
Cable

Internet Connection Speed:
16mb/s down 1mb/s up(according to speed test anyway heh)

Date & Time:
11:20 PM EST

Frequency:
Always

Character Name:
Auspice Lasserott

Race:
Hyur M

World:
Hyperion

Class/Level:
Bard 50

Area and Coordinates:
Limsa Lominsa Upper Decks 11-14

Party or Solo:
Solo

NPC Name:
Delivery Moogle

Monster Name:
None

In-Game Time:
Various 4PM-7PM

Steps:
Playing with a controller
Selected on Delivery Moogle
Selected "New"
Selected friend from drop down menu
Selected Attachment box
Selected HQ Deviled Eggs @ 51 quantity
Attempts to change stack size crashes the client to desktop at this point every time
I've just done this four times in a row and the only workaround seems to be to use mouse controls in lieu of controller inputs.