Since 1.5.0, bmp format doesn't work anymore with provinces/rivers map, instead PNG is required. What format/settings should we use while exporting with GIMP? For bmp files we knew it was 24bit without writing in space colours, while in PNG it's all a mistery, nothing was written in DEV diary nor anything. I've tried various settings but i'm not able to get the correct one (file size differs and it doesn't load).