Materia related messages are incorrectly categorized in the log.

Time: Always
Frequency: Always
World name: All
Character name: All
NPC name: None
Monster name: None
Class/Level: None
Party or solo: None
In-game time: Always
Area and coordinates: Everywhere
Steps:
1. Disable "Others Synthesis Messages".
2. Go near anyone converting items to materia or attaching materia, like a Market.
3. Wait.
4. Both types of materia messages show in the log.
5. Disable "System Messages".
6. Wait.
7. No materia messages show in the log.

Materia related messages are incorrectly categorized as System Messages - they should be My/Others Synthesis Messages.

PC Specs
-=-=-=-=- System Information -=-=-=-=-
SYSTEM_OS Windows 7 Ultimate 64-bit (6.1, Build 7601) Service Pack 1 (7601.win7sp1_gdr.130801-1533)
SYSTEM_CPU AMD Athlon(tm) II X4 635 Processor (4 CPUs), ~2.9GHz
SYSTEM_CORE_NUM SYSTEM_CORE_LOGIC 4 SYSTEM_CORE_PHYSICS 4
SYSTEM_BIOS Award Modular BIOS v6.00PG
SYSTEM_LANGUAGE English (Regional Setting: English)
SYSTEM_MEMORY 8189.094MB
SYSTEM_VIRTUAL_MEMORY 2047.875MB
SYSTEM_PAGE_FILE 16379.277MB
SYSTEM_STORAGE C:\ SYSTEM_HARDDISK_DRIVE SYSTEM_TOTALDISC_SPACE 749.998GB SYSTEM_FREEDISC_SPACE 661.980GB
SYSTEM_DIRECTX_VERSION DirectX 11
SYSTEM_GRAPHICS ATI Radeon HD 5700 Series
SYSTEM_GRAPHICS_DEVICE \\.\DISPLAY1
SYSTEM_GRAPHICS_CHIP AMD Radeon Graphics Processor (0x68B8)
SYSTEM_GRAPHICS_MAKER Advanced Micro Devices, Inc.
SYSTEM_GRAPHICS_VRAM 1013.844 MB
SYSTEM_GRAPHICS_SHARED_VRAM 3082.094 MB
SYSTEM_GRAPHICS_DAC Internal DAC(400MHz)
SYSTEM_GRAPHICS_DISPLAY_MODE 1920 x 1080 (32 bit) (60Hz)
SYSTEM_GRAPHICS_DRIVER aticfx64.dll,aticfx64.dll,aticfx64.dll,aticfx32,aticfx32,aticfx32,atiumd64.dll,atidxx64.dll,atidxx64.dll,atiumdag,atidxx32,atidxx32,atiumdva,atiumd6a.cap,atitmm64.dll
SYSTEM_GRAPHICS_DRIVER_VERSION 8.17.0010.1191
SYSTEM_GRAPHICS_DRIVER_DATE 3/28/2013 10:37:02 PM
SYSTEM_GRAPHICS_DRIVER_LANGUAGE English
3.0
SYSTEM_GRAPHICS_PIXEL_SHADER 3.0
SYSTEM_GRAPHICS_VERTEX_TEXTURE SYSTEM_SUPPORT
SYSTEM_SOUND Logitech THX 2.1 (Realtek High Definition Audio)
SYSTEM_SOUND_DEVICE_ID {3EF7920D-CFAD-4C1C-A3C5-06661F15EF1A}
SYSTEM_SOUND_DEVICE_NAME RTKVHD64.sys
SYSTEM_SOUND_DRIVER_VERSION 6.00.0001.6873
SYSTEM_SOUND_DRIVER_LANGUAGE English
SYSTEM_SOUND_DRIVER_DATE 3/29/2013 9:42:42 PM
SYSTEM_SOUND Realtek Digital Output (Realtek High Definition Audio)
SYSTEM_SOUND_DEVICE_ID {05BA407A-579D-4D76-ACC5-438E178C8A57}
SYSTEM_SOUND_DEVICE_NAME RTKVHD64.sys
SYSTEM_SOUND_DRIVER_VERSION 6.00.0001.6873
SYSTEM_SOUND_DRIVER_LANGUAGE English
SYSTEM_SOUND_DRIVER_DATE 3/29/2013 9:42:42 PM
SYSTEM_SOUND Plantronics Headset (Realtek High Definition Audio)
SYSTEM_SOUND_DEVICE_ID {CB336B0E-EAE6-4F26-9611-3205F6E7D624}
SYSTEM_SOUND_DEVICE_NAME RTKVHD64.sys
SYSTEM_SOUND_DRIVER_VERSION 6.00.0001.6873
SYSTEM_SOUND_DRIVER_LANGUAGE English
SYSTEM_SOUND_DRIVER_DATE 3/29/2013 9:42:42 PM
SYSTEM_INPUT {6F1D2B60-D5A0-11CF-BFC7444553540000}
SYSTEM_INPUT_NAME Mouse
SYSTEM_INPUT_REMARKS SYSTEM_GAMEPAD_AXIS 3 SYSTEM_GAMEPAD_BUTTON 8 SYSTEM_GAMEPAD_FOV 0
SYSTEM_INPUT {6F1D2B61-D5A0-11CF-BFC7444553540000}
SYSTEM_INPUT_NAME Keyboard
SYSTEM_INPUT_REMARKS SYSTEM_GAMEPAD_AXIS 0 SYSTEM_GAMEPAD_BUTTON 128 SYSTEM_GAMEPAD_FOV 0
SYSTEM_INPUT {7F4393E0-EC20-11E2-8001444553540000}
SYSTEM_INPUT_NAME USB Gaming Mouse
SYSTEM_INPUT_REMARKS SYSTEM_GAMEPAD_AXIS 0 SYSTEM_GAMEPAD_BUTTON 0 SYSTEM_GAMEPAD_FOV 0
SYSTEM_INPUT {7F45DDD0-EC20-11E2-8002444553540000}
SYSTEM_INPUT_NAME USB Gaming Mouse
SYSTEM_INPUT_REMARKS SYSTEM_GAMEPAD_AXIS 0 SYSTEM_GAMEPAD_BUTTON 0 SYSTEM_GAMEPAD_FOV 0
SYSTEM_INPUT {7F45DDD0-EC20-11E2-8003444553540000}
SYSTEM_INPUT_NAME American Power Conversion USB UPS
SYSTEM_INPUT_REMARKS SYSTEM_GAMEPAD_AXIS 0 SYSTEM_GAMEPAD_BUTTON 0 SYSTEM_GAMEPAD_FOV 0
SYSTEM_INPUT {7F45DDD0-EC20-11E2-8004444553540000}
SYSTEM_INPUT_NAME Saitek Eclipse Keyboard
SYSTEM_INPUT_REMARKS SYSTEM_GAMEPAD_AXIS 0 SYSTEM_GAMEPAD_BUTTON 16 SYSTEM_GAMEPAD_FOV 0
SYSTEM_INPUT {7F45DDD0-EC20-11E2-8005444553540000}
SYSTEM_INPUT_NAME Saitek Eclipse Keyboard
SYSTEM_INPUT_REMARKS SYSTEM_GAMEPAD_AXIS 0 SYSTEM_GAMEPAD_BUTTON 3 SYSTEM_GAMEPAD_FOV 0
SYSTEM_INPUT {7F45DDD0-EC20-11E2-8006444553540000}
SYSTEM_INPUT_NAME Saitek Eclipse Keyboard
SYSTEM_INPUT_REMARKS SYSTEM_GAMEPAD_AXIS 0 SYSTEM_GAMEPAD_BUTTON 0 SYSTEM_GAMEPAD_FOV 0
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-

Thank you for posting your concerns about this issue. I have made sure to submit all of your information to the development team and they will thoroughly investigate this matter, based on your report. Unfortunately, I cannot guarantee that a direct response will be posted on this thread, but I do recommend checking Here or Here for any details regarding the development team's investigation. Thanks again for your report!