Persistant Save Fails?

[Maelstrom Vortex]

I played for around 6 hours last night and lost all progress when I closed down amid a mission. The mission itself was only about 15-20 minutes long. I'd completed several others over the course of that time. When I re-entered the game I discovered that the persistent save hadn't updated since 6 hours prior despite many times leaving and re-entering the the space center which I thought was supposed to prompt an update of the persistent save. Have persistent saves changed or is this an error or failure to save?

[sal_vager]

Persistent saves have not changed and KSP should update the persistent.sfs periodically, also on exit to the space centre.

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