Run GD5 as administrator.
If you use beta b92 please update to b93. There is a nasty bug with debugger in b92.
About the tiled background, you use Tiled Sprite right ?
Can you try this test build, the API graphic engine is updated. It’s important to export manually and create your own .apk !
Otherwise with the apk buil service the version will be the same as you current GD5 without the new Graphic API updated.