HTML5 Output - Bug report - 4.11 Preview 7

we discovered a serious bug in the Unreal Engine 4.11 (Preview 7) HTML5 output.

Unfortunately it is not possible to use the HTML5 output in the window mode (for example with an iframe) The UMG is cut off at the horizontal edges. When I push the “Fullscren Button” everything is shown correctly. Very strange. I tried everything to solve this problem. But without success. This problem didn´t occur in the old versions of the Unreal Engine 4. I tested the HTML5 output also with 3 other projects. The problems are always the same.

Best regards, Andreas