Self Service Reporting run report

Hi all, I've a strange issue with self servivce reporting. I've created a new report into my ARAS SP8, and it works fine, I can run the report from myReports, but if I logout from Aras and login again in a second time and try to run or edit my report this doesn't work (blank window) but if I go to self service reporting under the administration menu and try to create a new one then also my previous report can be run. I'm not able to understand how if I try directly to run the report it doesn't work while it works only if before I open the creation of a new report... thanks