Intermittent problem

[fmoreira-spawn]

Sometimes the interface has problems (visible in the images), the color scheme starts screwed, the text is inverted, and sometimes imperceptible as if it assumed another font.
I'm using BabylonJS.

Any suggestion of the cause of this problem?

[markcmagro]

I had this same issue (missing background and garbled font).
It was happening because in my WebGL app I was flipping Y.

I am using imgui.umd.js and imgui_impl.umd.js.
To fix the issue I edited CreateFontsTexture() in imgui_impl.umd.js. I added the two lines with comments below:

exports.gl && exports.gl.pixelStorei(exports.gl.UNPACK_FLIP_Y_WEBGL, false); // Flip pixel data to fix background and fonts
exports.gl && exports.gl.texImage2D(exports.gl.TEXTURE_2D, 0, exports.gl.RGBA, width, height, 0, exports.gl.RGBA, exports.gl.UNSIGNED_BYTE, pixels);
exports.gl && exports.gl.pixelStorei(exports.gl.UNPACK_FLIP_Y_WEBGL, true); // Restore flip