The problem of 'blank page' is occured also in vers 1.2.5 ... !!
After changing the error reporting to 'E_ALL' , I got message that the problem was
on the file ..../components/com_joomlawatch/admin.joomlawatch.php
still can not find the file 'admin.joomlawatch.html.php'.
This error is because of that I'm not using the DEFAULT admin directory 'administrator'.
So, at line 48 of file 'admin.joomlawatch.php' change the PATH (NAME) of admin directory from 'administrator' to 'YOUR_ADMIN_DIRECTORY_NAME' :
require_once (JPATH_BASE2 . DS . "YOUR_ADMIN_DIRECTORY_HERE" . DS . "components" . DS . "com_joomlawatch" . DS . "admin.joomlawath.html.php");
Do also to file 'visits.php' & 'uninstall.joomlawatch.php'
It works ....
- Abraham -