It took me a while but new version of VHD Attach is here. Although there isn't much changed on surface, internals went through significant changes and quite a few bug-fixes.
Probably most visible change is adding auto-mount button directly on toolbar. It seems that lot of people were unaware of feature because it was buried in Options dialog.
Version is available at https://www.medo64.com/vhdattach/.
Enjoy.