Actions to reproduce :

Create new project, compile -> see vmicro log
Add Myclass.cpp/Myclass.h to the project, compile, only MyClass.cpp is compiled -> see vmicro log
No change to any file, compile, MyClass.cpp is compiled again -> see vmicro log.

Do not know whether it is related but the compile command for the "ino" is "...." "C:\Userdata\VMicro\Projects\NewSP14\NewSP14\Debug\NewSP14.cpp" -o "C:\Userdata\VMicro\Projects\NewSP14\NewSP14\Debug\NewSP14.cpp.o"

And for the MyClass.cpp : "...." "C:\Userdata\VMicro\Projects\NewSP14\NewSP14\Debug\MyClass.cpp" -o "C:\Userdata\VMicro\Projects\NewSP14\NewSP14\Debug\\Debug\MyClass.cpp.o"

Notice the additional \Debug level in the path.

See attached zip for logfiles.

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Thanks for the report.

Have you enabled the "Build In Project Intermediate" option, shown in vMicro > General > Global Options, beneath the compiler section?

If this is set back to False it will avoid the issue while we investigate further.

Yes, I have "Build in project intermediate" switched on.
I keep in on for now, the mentioned issue does not effect my working ver much.

FYI : The project intermediate folder contains lots of debug levels after several compiles.

See attached picture,

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The latest release (22.04.29-5) should resolve the issues with the CPP Build Caching, and the folder creations in the build folder when using the Build In Project Intermediate, and is available from the top of the below board:
https://www.visualmicro.com/forums/YaBB.pl?board=VS_ARDUINO_EXT_RELEASES

Confirmed working OK now.