This is a follow up to my question here.
A custom CSS file is referenced in my customer master page, like this:
<SharePoint:CssRegistration Name="/_catalogs/masterpage/custom.css" runat="server"></SharePoint:CssRegistration>
Problem: when I make changes to the CSS file (using SharePoint Designer) the changes are not reflected.
If I comment out the reference to the CSS file in the master page, this is reflected fine, so changes to the master page is not the problem.
For info, publishing is not enabled on the site collection.
Could this be something to do with the CSS file residing in the master page gallery?