Display of Categories and Products - Divs and Tables - 1 column only

-- HikaShop version -- : 3.1.1
-- Joomla version -- : 3.7.2
-- PHP version -- : 5.6.24
-- Browser(s) name and version -- : All
-- Error-message(debug-mod must be tuned on) -- : No specific error thrown

After upgrading to 3.1.1 all the categories and products (including 'recently viewed' products) will not display in more than 1 column.

Categories were 2 columns - Recently viewed were in 3 - Products in 2 columns etc

None of the HikaShop menus or HikaShop configuration settings seem to have changed from their original settings. Have tried re-applying and created new menus with no luck.

No modifications other than minor edits to the language file.

Wonder if someone had any idea what is going on?

Much appreciated Jerome

My search term using "3.1.1" didn't find the results you listed - something I've learned for any future searches.

The custom CSS was being used in the Configuration settings / Display / CSS / Front-end CSS File. Set this to "default" and everything works fine now.

Thank you for pointing me in the right direction.

Simon