Hi there, Henri.
I've found that regions in some OpenSim grids only load their respective world map tiles after I click on or search for them. I tested this on OSGrid, Mobius Grid and 3rd Rock Grid - only the last works normally, as these linked screenshots show:
OSGridMobius Grid3rd Rock GridTo be thorough, I also checked the grids in Singularity and Alchemy, and there were no issues.
However, this might not just be a Cool VL Viewer problem. Seems that 3RG runs on OpenSim v0.8, while OSGrid and Mobius are on dev branch v0.9 - which was first released late last year, and the map bug started happening around then. Coincidence or not, I don't have the skills to look into it further, so hopefully you can figure it out.