I have a weird problem on one iMac running macOS Sierra where disk mounting is never completed.
I wonder if some other kernel extension could block this? Maybe it's not macOS Sierra related? In fact I tested on vanilla macOS Sierra installation and there everything works just fine.
Among default apple kernel extensions I noticed these ones (on this particular iMac) that are different from vanilla macOS Sierra installation:
com.acronis.fileprotector
com.parallels.kext
com.github.osxfuse.filesystems.osxfuse
com.apple.filesystems.ntfs
I wonder if someone knows if any of these could somehow interfere with osxfuse preventing the mount procedure of osxfuse disk?