Reports are note retreieved by the application if opened in Crystal Report

Hi to all.

I am trying to modify one report used by an application I use. The application is made with .NET and, when I launch a preview or a print of this report, the report is not loaded if it is already opened in Crystal Report. To have it loaded, I must close it from Crystal.

Some time ago (july 2011), this was not a problem. I don't know if .NET version is changed or if Crystal is upgraded. I have CR Developer 12.2.0.290 version installed and the application runs under .NET frameworks from 2 to 4. In tehs erver machine are also installed CR Basic Runtime for V.S. 2008 and C.R 11_5 NetSetup.

Does anybody know if I can try previews whit RPT opened in C.R ?

Many Thanks.