Today UModeler 2.6.6 for hotfixes have been submitted so I think it'll be available in a couple of days. And I found that 2.6.5 release notice has not been posted yet. Actually it was out 2 weeks ago. So I've added the 2.6.5 released note to the end.
Hotfix : Fixed bug where triangle count is not correct Hotfix : Fixed bug where the detached uv islands or polygons don’t move separately without holding CTRL+SHIFT. Hotfix : Fixed bug where blue cubes representing vertex positions and polygon center positions aren’t vanished when UModeler object is deleted.
Hotfix : Fixed bug where moving a vertex or an edge sharing two polygons that have different materials doesn’t work.