Interesting .. you have
latest Reminderfox as at 10th Oct 2016.
Which version? It should be 2.1.5.5.3!?
Anyhow,
try to go for this:(copied from this Reminderfox Forum https://groups.google.com/forum/#!topic/reminderfox/uhpozZSphPo)
-- close Reminderfox main dialog/list
-- Open the TB Preferences --> Advanced --> General --> [Config Editor ..]
-- to Search enter: extensions.reminderFox.storeFile
-- on the row use the right mouse click and "Reset"
-- Open the Reminderfox Options and check "Reminderfox Data Location" on the first tab. Eventually change from default location to an individual
Same for FX, hope it helps
Guenter