I have a computer which will not re-generate code after changing something in IOC file. Yet my home laptop will re-generate. I have uninstalled and reinstalled with same result. Even updated from 1.2.0 to 1.3.0.

[TPeča.1]

Check the STM32CubeIDE/your_workspace/.metadata/.ide.log , code generator prints out some error information there, maybe by comparing the log file between your computers (using a diff tool) can give you an idea what's wrong. You can delete the existing file to get a trace of a single session.

You can also try bumping the Threshold value from INFO to DEBUG in STM32CubeIDE/your_workspace/.metadata/.log4j.xml

[TPeča.1]

I've also had an issue with code generation when the workspace configuration got corrupted (this happens more often than you think).

In that case, try removing the whole STM32CubeIDE/your_workspace/.metadata folder. You will loose all customizations to Eclipse settings + you need to re-add all projects back to the workspace, but this puts it back into a sane state.