Broken directory

Not sure if this is a Netsurf or RISC OS specific thing but I noticed
Netsurf was reverting to default choices and losing its hotlist. I
looked at !Boot.Choices.WWW.Netsurf which reports "Broken directory"
if I try to delete or move it.

Any way out?

(Using NS 3.1 Dev #1264 on Raspberry Pi but I think the problem has
been around for a week or two)

thanks

--
Christopher Dewhurst