Mountian Lion does not recognize Yosemite in Start up disk

Greetings All,
I recently installed Yosemite on the partition of my HD (1TB) I ran Mavericks on.
On another partition of the same HD I run Mountian Lion (I use Pro Tools 9.06 on it).
When working within Mountain Lion, I used to switch to Mavericks (and vice versa) via System Preferences / Start up disk. Now Mountain Lion apparently does not recognize Yosemite as a bootable disk: in System Preferences / Start up disk Yosemite does not appear (as Mavericks used to do).
Does anyone know what's the cause of Yosemite not being available as Start up disk in System Preferences in Mountain Lion?
Kind regards,
Gerrit
MacBook Pro mid 2010
2.4 dual core intel cpu
1 TB HD; 3 partitions: Mountain Lion; Yosemite; Data
8 GB RAM

gerritfromnijmegen wrote:
...Another thing is a language issue: what you call the "media" line I can't translate with accuracy into Dutch. I guess it is called "Naam" (Name) in the second line of the information panel in Disk Utility and this says: Volume. I'm adding a screenshot here, maybe you'll be able to make out what what is by the way subjects are ordered in it?...
Your hard disk drive is shown divided up into three partitions: Mountain Lion, Yosemite, and the Data partition, all of which are indented in the list on the left in Disk Utility. The "media" on which the partitions exist (your Western Digital hard drive device, which is not indented), is shown in the traditional configuration we've known for years (so I apologize for introducing "Logical Volume Groups" to the discussion). It's been my experience that sometimes, installation of Yosemite will take the partition arrangement you have and convert it into a Logical Volume Group which becomes much more difficult to work with, and much, much more difficult to explain.

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