Recently there have been frequent updates for hotfixes because there were big code changes in UModeler 2.6 which made some problems that wasn't found when 2.6 was released. Fortunately some users found the issues and reported them. I managed to fix them through several updates for the last few days. The changes are as follows.
Version 2.6.4 - May.10.2019
Hotfix : Fixed errors while UModelerizing.
Hotfix : Fixed bug where the selected UModeler object disappearing when entering the game mode.
Hotfix : Fixed bug where icons look a little bit whitish.
Version 2.6.3 - May.7.2019
Hotfix : Fixed bug where Export Tool in UV Editor doesn’t work in the latest Unity.
Version 2.6.2 - May.3.2019
Hotfix : Fixed bug where combine objects and boolean operation don’t work.