OK, I did a clean reboot.
Fences worked fine so I began re-enabling processes and restarting.
Re-enabled all processes in sections and Fences still working as it should with all re-enabled.
Did a 'normal' reboot on the new clean ID. Fences still working.
Went back to my normal login (which is also an Admin).
Fences behaves as it did previously, limited rows.
Disabled all processes on this ID,
still limited rows but it seems that there are different numbers of rows in different Fences.
I don;t see any obvious correlations.
Re-enabled process and am back where I started from.
How do I post images here?