CR4E 2.0 and CRXIR2

I developed an application where we are using the run-time engine from CR4E 2.0.4 to execute and display reports. All of our report modifications are done in the CRXIR2 IDE. The only thing the run-time engine should be modifying on our reports should be the connection information as it is set during execution. Funny thing is, anytime the engine "modifies" a report, I can no longer open it in the IDE. Is this expected behavior?

I thought 2.0 was the java version compatible with 2008, which should be backward compatible with XI, yes?

Victor