I'm chatting with FC members while crafting. If I'm currently typing something when the craft finishes and the Crafting Log window pops back up, the text input cursor in the chat log is moved at the start of the text input box (or a few characters in). In addition, I can only type a few characters before text input no longer works. clicking outside the chat log window and re-positioning the cursor back at the end of the already-typed text fixes it.

Time: November 17th 2015 around 11:30 AM (GMT+1), several times
Frequency: most of the time the conditions described are met
World name: Masamune
Character name: Inzoum Zimia
NPC name: N/A
Monster name: N/A
Class/Level: CUL 60
Party or solo: Solo
In-game time: night time, most likely irrelevant
Area and coordinates: Ishgard, the Pillars, near the market board at the Jeweled Crozier
Steps:
1. Begin crafting any recipe
2. Use a macro to advance progress (my macro needs 1x more progress action on higher recipes)
3. Begin typing something in the chat log
4. Use Careful Synthesis II (or any other) to finish crafting and continue typing in the chat log while the action animates and crafting finishes
5. When the Crafting Log re-appears, the text input cursor in the chat log gets moved to a different position, typing becomes locked after a certain amount of text is input

WORKAROUND:
Clicking out of the chat log and clicking in the text input again to reposition the cursor seems to re-enable text input. Repositioning the cursor without first clicking out of the chatlog doesn't.

Connection Specs
- Type of internet connection/provider: VDSL2 40Mbps, Proximus (Belgium)
- Modem maker/model number: Proximus b-box2

PC Specs
-=-=-=-=-=-=- FFXIV Information -=-=-=-=-=-=-

MyDocument C:\Users\inzou_000\Documents
FINAL FANTASY XIV - A Realm Reborn C:\Program Files (x86)\SquareEnix
FINAL FANTASY XIV - A Realm Reborn Language 1 Region 3
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ProxyServer unspecified
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SYSTEM_INPUT {6F1D2B61-D5A0-11CF-BFC7444553540000}
SYSTEM_INPUT_NAME Clavier
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SYSTEM_INPUT {9F401B20-173D-11E4-8001444553540000}
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SYSTEM_INPUT_NAME Controller (XBOX 360 For Windows)
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-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-

Laptop Model Name/Number: Asus ROG G750JM

Gamepad Manufacturer: Microsoft
Gamepad Model Name: Xbox 360 controller for Windows
Gamepad Part Number: No idea

Browser Information
- Name and version of the browser currently in-use: Firefox
- Internet Explorer Version: Whatever comes with Windows 10