UModeler 2.6.19 has been released.
Some annoying bugs have been fixed in this update. For example mesh colliders of UModeler didn't work on play mode when UModeler menu panel or UV editor is alive. And a mesh or polygons disappeared in some cases. I thought they would be tricky to be fixed so I put off dealing with them. However finally I figured out why they happened and resolved them this time. I hope this improvements will help you work on your project more effectively.
Fix bug where collider doesn’t work on play mode.
Fix bug where UModeler mesh disappearing when clicking on a umodeler object after exiting play mode.
Fix polygons disappearing while using PushPull tool.