what is the problem?
You may be right, Gerald, if software doesn't work properly, it's not a problem at all, just forget that buggy software.
But that's not my point of view. I think Tinycore is a great piece of software worthwhile to be kept free of unnecessary bugs.
Tinycore 2.2 was able to shutdown properly within Virtual Box, so should Tinycore 2.3.x too.