Control-space not working in Notepad++

I've been using Notepad++ forever but must have done something to stop Control + Spacebar from opening the 开发者_StackOverflow中文版intellisense (auto complete) of whatever language I am busy with. Anyone know what might be causing this?

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Check the "Shortcut Mapper" on the "Settings" menu

"Function Completion" should be mapped to "Ctrl + Space"

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Just re-installed Notepad++ and it worked. Thanks for all the suggestions though.