Failed to generate G-Code File V3.4.2

Hi everyone,

since 2 days I can’t ganerate G-Code Files for laser engraving. I repeatetly get the error Message “Failed to generate G-Code” and in the dev view: "app.4b4ad684e4b168efaaf0.bundle.js?_=1586873599473:2 THREE.WebGLRenderer: image is not power of two (541x331). Resized to 512x256 "

Error occours on every image or text i try to use - even those who worke before without problems.
I uninstalled Luban, cleared the registry & reinstalled Luban (on D: volume instead of C: volume as for the first installation) -> Problem still up.

Any solutions?