Refresh inop?

Hi.
 
6.0.2159
 
Contect menu "Refresh" (as well as F5) inside a folder doesn't seem to work. This was still working in 6.0.2126.
 
I imported settings using .reg file from 6.0.2126. Could this be the source of the problem?
 
Is there a configuration related to Refresh which might stop this from working properly?
 
Thanks,

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