First thing I'd check would be logs, then perms/ownership:
ll /usr/local/psa/admin/plib/report
drwxr-xr-x 2 root root 4096 Jul 8 05:58 report
[root@ns2 report]# ll
total 168
-rw-r--r-- 1 root root 1952 May 6 00:16 autoreport.php
-rw-r--r-- 1 root root 20048 May 6 00:16 class.ClientReport.php
-rw-r--r-- 1 root root 49320 May 6 00:16 class.DomainReport.php
-rw-r--r-- 1 root root 3992 May 6 00:16 class.ReportAutoEditForm.php
-rw-r--r-- 1 root root 4880 May 6 00:16 class.ReportAutoList.php
-rw-r--r-- 1 root root 12624 May 6 00:16 class.ReportAutoManager.php
-rw-r--r-- 1 root root 3792 May 6 00:16 class.ReportAuto.php
-rw-r--r-- 1 root root 4392 May 6 00:16 class.ReportEditForm.php
-rw-r--r-- 1 root root 224 May 6 00:16 class.ReportExtension.php
-rw-r--r-- 1 root root 12592 May 6 00:16 class.ReportManager.php
-rw-r--r-- 1 root root 16680 May 6 00:16 class.Report.php
-rw-r--r-- 1 root root 2360 May 6 00:16 class.ReportSections.php
-rw-r--r-- 1 root root 3312 May 6 00:16 class.ReportsList.php