Thank you for the quick 8.0.0.1 release. I also had issues with the ColCount property. With the 8.0.0.0 Pack, some frames of a larger project didn't load any more in the IDE, neither in XE5, nor in Seattle. I got weired AVs and Out of Memory issues while a grid ColCount was set during form loading.
Anyway, just wanted to let you know that 8.0.0.1 magically fixed that.