Update: found the problem, the grid was broken by Adj gift registry.
The frontend catalog grid view is not working.
Not sure when it went wrong, perhaps after upgrade to 184.108.40.206
I am using Absolute theme f001 but it is the same problem with the default Modern theme.
The grid view is a single column only:
I have not done any hacking. Everything else seems to be ok.
I have tried different settings under admin: catalog: frontend
Any suggestion for a solution much appreciated.