(Potential fix being investigated) On some devices, Writing Tools does not work correctly with the default hotkey. To fix it, simply change the hotkey to ctrl+` or ctrl+j and restart Writing Tools. PS: If a hotkey is already in use by a program or background process, Writing Tools may not be able to intercept it. The above hotkeys are usually unused.
The initial launch of the Writing Tools.exe might take unusually long — this seems to be because AV software extensively scans this new executable before letting it run. Once it launches into the background in RAM, it works instantly as usual.