I’ve been going over this for a few days now, trying a lot of routines from FAQ and other threads, but sofar without tangible results.
After installing CIS 4 a few days ago, on a clean system (fresh image), a variety of games available through Steam no longer function correctly. Not all of them, but for example EVE Online as well as Civilization IV present themselves with issues, typically the application shutting down unexpectedly.
Considering the new sandbox feature, I’ve tried a few reinstalls (applying a clean OS image each time) with and without CIS IV, with and without sandboxing the applications, andsoforth. Common theme becomes clear: with CIS 4 installed, EVE Online randomly crashes, and Civilization fails to load properly in a manner which is unnervingly similar to the experience of trying to run XL Civ IV maps on a machine with not enough memory.
So, I tried running Civ IV through Steam without CIS 4 active (disabled for loading with windows), and Civ IV launches and loads fine. Now I try running Civ IV through Steam with CIS 4 active, it fails. If I disable CIS 4 (individually or completely), it fails. In a similar format, it makes zero difference whether either executable is marked as a trusted vendor / application.
All in all, that leaves me pretty confused, and somewhat frustrated. If anyone has similar experiences, or other insights, please feel free to voice these.
I’ve disabled CIS both via the configuration options (selectively chosing “disabled” from the right click menu for each element of CIS via the taskbar CIS icon), as well as disabling the CIS application as a whole by removing its entry from the startup list.