Release 52 on Win7 64bit. GTX560ti.
Some system expressions when using a TiledBackground resulting in not being able to preview "gray screen"
Distance / Angle / Comparing an instance variable. With a TiledBackGround do not work as expected in Realease 52.
an updated runtime.js posted here Fixes Distance and Angle.
But comparing an instance variable from a TiledBackground Still results in no preview "gray screen"
Example .capx of the issue