Giddy for Goobbues and Fight Firesand with Fire Bug - Mount Custom Emote not working

Time: 11:01am GMT
Frequency: Everytime I right-click to activate custom emote for the quest, either with nothing targeted or destination targeted
World name: Cerberus
Character name: Aislinn Skylar
NPC name: Tonaxia (Quest Giver), Cheerful Sylph (secondary NPC to spawn mount)
Monster name: n/a
Class/Level: WHM, Level 50
Party or solo: Solo, and in a party
In-game time: 12:40am
Area and coordinates:
East Shroud
a:- Tonaxia 22x y26
b:- Cheerful Sylph 25x y25
c:- Destination 1 25x y23
d:- Destination 2 20x y21

Steps:
1. Accept quest from Tonaxia, NPC Beast Tribe Quest "Giddy For Goobbues"
2. Talk to Cheeful Sylph, mount spawns ok
3. Right-clicking, no sneeze is activated, UI disappears for few seconds, then reappears.
4. Go to first destination, select and right-click, the UI disappears for a few seconds then comes back. Nothing else happens.
5. Tried trashing quest, relogging, then accepting quest again. Still didn't work.

The other Beasttribe Quest Fight Firesand with Fire has exactly the same behaviour. Both custom mount quests are bugged for me. My party member had no problems with these quests, nor has anyone else I've spoken too so far! This happened last night, but replicated the bug this morning for fuller bug report.

Connection Specs
- Type of internet connection/provider: Sky Broadband (PPPoE)
- Modem maker/model number: Sagemcom F@ST2504n

PC Specs
-=-=-=-=- System Information -=-=-=-=-
Operating System
Windows 8.1 64-bit
CPU
AMD FX-6350
Vishera 32nm Technology
RAM
8.00GB Dual-Channel DDR3 @ 802MHz (11-11-11-28)
Motherboard
ASUSTeK COMPUTER INC. M5A97 LE R2.0 (Socket 942)
Model M5A97 LE R2.0 (Socket 942)
Version To be filled by O.E.M.
Chipset Vendor AMD
Chipset Model RD9x0
Chipset Revision 02
Southbridge Vendor AMD
Southbridge Model SB910/950
Southbridge Revision 40
BIOS
Brand American Megatrends Inc.
Version 2006
Date 01/10/2013
Graphics
HP 23xi (1920x1080@60Hz)
2048MB ATI AMD Radeon R7 200 Series (ATI AIB)
Manufacturer ATI
Model AMD Radeon R7 200 Series
Device ID 1002-6658
Subvendor ATI AIB (1787)
Current Performance Level Level 0
GPU Clock 1160.0 MHz
Temperature 37 °C
Driver version 13.251.9001.0
BIOS Version 113-C5820400-101
Memory Type GDDR5
Memory 2048 MB
Bandwidth 105.6 GB/s

Storage
931GB TOSHIBA DT01ACA100 (SATA)
Optical Drives
ATAPI iHAS124 E
Audio
Realtek High Definition Audio

Peripherals
Microsoft USB Dual Receiver Wireless Keyboard (Mouse and Keyboard Center)
Device Kind Keyboard
Device Name Microsoft USB Dual Receiver Wireless Keyboard (Mouse and Keyboard Center)
Vendor Microsoft
Location Microsoft Hardware USB Keyboard
Driver
HID Keyboard Device
Device Kind Keyboard
Device Name HID Keyboard Device
Vendor Logitech
Location USB Input Device
Driver
Microsoft USB Dual Receiver Wireless Mouse (Mouse and Keyboard Center)
Device Kind Mouse
Device Name Microsoft USB Dual Receiver Wireless Mouse (Mouse and Keyboard Center)
Vendor Microsoft
Location Microsoft Hardware USB Mouse
Driver
Printers
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Laptop Model Name: n/a
Laptop Model Number: n/a

Gamepad Manufacturer: n/a
Gamepad Model Name: n/a
Gamepad Part Number: n/a

Browser Information
- Name and version of the browser currently in-use: Pale Moon Version 24.6.2 x64
- Internet Explorer Version: n/a

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Title correction: should be Fighting Firesand with Fire