Recently discovered that if you compile the VPC with a version of Lazarus smaller than 2.0 then some labels and contents of the comboboxes will become invisible. I uploaded in repository a suitable version of Lazarus but only for Fedora Linux – my temporary development Linux station.

As a side note, when Adwaita theme and Liberation Sans 12 font are applied for your desktop, it works well with VPC application and are highly recommended.