Dreikblack

After VS update i managed to build a projects

This issue seems to be gone with Vulkan

Works for me with original .json from top post. Try to create new component via editor with + button

btw maybe some letter is not latin? Like Cyrillic 'C' instead of English one in folder and file name.

Resolved this issue with Josh help via AddMod(quakepath) which "adds another folder and makes the engine think that folder is in the current dir"

Now in 1.03 it works for brush and face

widget->SetColor(1, 0, 0, 1, WIDGETCOLOR_FOREGROUND);

Edit button just for having 2 buttons in a menu:

add  shared_ptr<Panel> contextMenu; to ListView.h
In ListView.cpp update Initialize method:
bool ListView::Initialize(const int x, const int y, const int width, const int height, shared_ptr<Widget> parent, shared_ptr<ListViewData> header, int columnCount) { bool isInit = Widget::Initialize("", x, y, width, height, parent, 0); itemSize = iVec2(width, getItemHeight()); ListView::columnCount = columnCount; initBlockCount += (columnCount * 2); ListView::header = header; contextMenu = CreatePanel(0, 0, 100, 40, gui->root); contextMenu->Hide(); auto editButton = CreateButton("Edit", 0, 0, 100, 20, contextMenu);//just for an example, no function auto removeButton = CreateButton("Remove", 0, 20, 100, 20, contextMenu); ListenEvent(EVENT_WIDGETACTION, removeButton, RemoveCallback, Self()->As<ListView>()); return isInit; } and MouseDown method:
void ListView::MouseDown(const MouseButton button, const int x, const int y) { contextMenu->Hide(); if (x >= 0 and y >= getItemHeight() and x < size.x and y < size.y) { int itemId = y / getItemHeight() - 1; if (itemId >= 0 and itemId < items.size()) { selectedItemId = itemId; Redraw(); if (button == MOUSE_LEFT) { if (pickItemListener) { pickItemListener(Event(EVENT_WIDGETACTION, Self(), selectedItemId)); } } else if (button == MOUSE_RIGHT) { contextMenu->Show(); contextMenu->SetShape(iVec2(x, y), contextMenu->GetSize()); } } } } Also add this function to same class:
bool RemoveCallback(const Event& ev, shared_ptr<Object> extra) { auto listView = extra->As<ListView>(); listView->removeSelectedItem(); listView->contextMenu->Hide(); return true; }  

Tried newer version from here - https://github.com/UltraEngine/ultraengine.github.io/raw/main/files/UltraClient.exe and it worked . Found in a patch notes.
Probably main link should be updated? - https://ultraengine.github.io/files/UltraClient.exe