MaidFiddler error is because you deleted Sybaris folder at some point but you didn't reinstall MF afterwards. This happens when you reinstall CMI and it does the default cleanup routine.
Did you at least install the latest update for your game version and installed latest
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Try to rename winhttp.dll to _winhttp.dll. It will disable all plugins. Try to see if the UI loads fine without plugins.
If it doesn't then the game is fucked. Only you know where you got it from and how you installed/extracted it.
The only instance I know about when buttons are missing is when you install broken presets and the whole Preset tab will be broken as a result. But not the entire edit UI.
At least post a log from COM3D2x64_Data/output_log.txt