product online configuration not working

i have tested the vdesigner with a product (mug)
Problem is: After loading the "design online" canvas it is not possible to delete the example text.
Also i can´t fill in a pic from gallery and drag and drop it to the product. it is only screened in the upper left corner of the canvas.

Hi,
There is an option in backend to lock/unlock different layers. Please check if It's locked.

here?

Please check attached.

I see, but this is frontend, not as you told me the backend. But still there is the problem, that i can´t delete the "good mornin" text by clicking on the trash bin. I have to remove it with the text-tool, that is not customer friendly and also, if i insert a clipart from the gallery it appears in the top left area of the canvas and is not drag- and dropable.

the problem seems to appear only with the mug canvas. if i take another one like shirt/bag/hoodie the configurator works as it should work