I had an issue where I couldn't see the Formz Manager anymore as well but when I reinstalled it, I got an error using the wrong cloud ID (it was from the original cloud that I had cloned). In the error log I had this:
[2013-03-27 08:19:13] (ERROR @ /connectors/system/errorlog.php) Path specified for package translations is not a valid or accessible directory: /paas/cXXWrongID/www/core/components/translations/model/
It was stuck on a path from a previous cloud I had cloned.
I had to edit the path and input the correct Cloud ID in the Extension Packages system setting and it all came back and worked again.