Luban 4.2.2. Bitmap import to Laser modul


what´s wrong with Luban 4.2.2. ?
When importing a bitmap file (JPG or PNG) exported by inkscape to the Luban Laser module, I get a white square in Luban.
As long as the import bar is growing towards 100% the bitmap can be seen in the background, After the bar has reached the 100% the bitmap changes to a white square/rectangle…???

when I try to delete this item from EDIT section by right button CUT command,
the the whole canvas turns white and Luban has stucked.

any ideas guys ?

thx in advance