I have found a bug with the column chooser in grid version 4.6.

To replicate this bug you need to successfully import a grid configuration using jqGridImport method.

Then activate the column chooser and modify the column list. in my use case adding a column to be shown.

click 'ok' and the grid body where you would normally see the data results is replaced with solid thick blue lines.

note: the column chooser works successfully before importing a grid configuration.

Kenneth