gdm2054

Since I updated Cura from version 13.04 (to 13.06.3 and 13.06.4) I experience a strange behaviour. Loaded objects are displayed in solid black color (along with the Ultimaker bed representation). All other features work correctly. I read a post saying that this problem was supposed to be solved in 13.06.4 but this seems not to be the case for me. HW : laptop Acer Aspire 5315 Windows Vista Home edition. Cura 13.04 used to work OK on this same computer. Has anyone a clue on how to solve this issue ?