Partition 'Missing' in System Restore.

[Lightworks]

This is weird, but one of my partitions is 'missing' in the System Restore configuration panel. It's listed, but the panel says 'missing', and I can't configure any settings for it. However, it appears in 'Computer', I can read and write from it, and all other software can see and use it perfectly.

I did delete the partition, but re-created it less than half an hour later.

Any ideas anyone?....and be gentle with me, I'm new here.

Ta Muchly.