Module version: User Read-Only 7.x-1.3
Admin theme: Seven 7.15

Thank you for this straightforward and very useful module.

While default user field names are displayed as links in the UI and can be clicked to expand the field options, I have found that custom user fields are not linked and do not expand. This behavior appeared for me in both Seven and in a custom theme.

I was able to edit options for these fields by removing the 'collapsed' class in Firebug. Once options are set, the fieldset remains expanded.

I'm not sure if this is a genuine display issue, or related to theme and/or configuration.