Radio buttons and checkboxes issue

[Nukethefox]

Radio buttons and checkboxes on the VC Buttons Properties dialog window are not visible:

On any other dialog window, the checkboxes and radio buttons are working:

[Nukethefox]

This also happens when trying to assign a function to a button (picture1) and when trying to assign a function to a cuelist (picture2, but note the radio buttons are ok on this case).

When trying to assign functions to sliders or the speed widget, both checkboxes and radio buttons are ok: