I found out some bugs investigating a umodelerization issue and fixed them in UModeler 2.6.13 which is available. Most of them are related to a bigger scaled UModeler mesh as well as UModelerization. See more details below.
Version 2.6.13 - Aug.2.2019
Hotfix : BoxTool - Fixed one click build bug where unnecessary polygons were created. Hotfix : Fixed bug where Global/Local Overlay size and location are wrong when a mesh is translated/roatated/scaled. Hotfix : Fixed missing UVs after UModelerization. Hotfix : Fixed wrong outline of a scaled mesh. Hotfix : Fixed black polygons appearance after UModelerization due to the wrong calculation of the plane normal.