I installed 1.1 on 1.5.7 with legacy on. Installation succesfull!
The only tab that works is Configuration tab..if i clik on any other / tab mangement/ user managemet/ or so i get this error message on the blank screen:

Fatal error: Class 'mosPageNav' not found in ....../html/administrator/components/com_comprofiler/admin.comprofiler.controller.php on line 880

?help