Codeblocks Code completion working partially

[popashtefan10]

My issue is that the code completion does not show me suggestions for C functions, for example when I type "sca", or "scan" it does not show any function suggestions at all (I wanted it to show scanf). I run codeblocks.exe from C:\Program Files\CodeBlocks. Also, if I run the CbLauncher.exe file from the same folder it shows me scanf, printf and other C functions. Before this issue I have used Codeblocks on the same PC, so I might have changed by mistake some settings which caused this issue.
I reinstalled Codeblocks from the official site, binary releases for Windows, codeblocks-20.03mingw-setup.exe.

Later Edit: the C functions work properly even though they don't show up in the code completion suggestions.

[Miguel Gimenez]

Go to Settings -> Editor -> Code completion -> C/C++ parser and verify if at least the first two options are checked

[popashtefan10]

All 5 options are checked. Also I have the "Use one parser per project" option checked, even though it doesn't work with the other one as well.

[popashtefan10]

I managed to solve the problem by deleting the "Codeblocks" folder inside %APPDATA% after I uninstalled it. I reinstalled CB and code complete works fine.

[alexmk]

I found that "Code completion" doesn't work for WxWidgets but only if I chose new project as console application, not wxWidgets. 
wxWidgets compile successfully.
Operationg system - Linux Mint. Code blocks installed from repository.
What setting need to add to fix this?

[alexmk]

I found solution:
Open 2 projects, where one is configured for wxWidgets project.
In the settings->editor-> Code completion -> C/C++ parser-> check "Use one parser for hole workspace".
Now it works fine.

[mariusm]

Have the same problem 

If I switch to "Use one parser for hole workspace" or "One parser per project" the code completion restart and works for a while but stop again after a few minutes.

How to solve this error from source or how can I add a button on toolbars for easy restart ?