Looking at the error log, stupid me , I could have thought of that one
Yes, in errors logging there is a line for every opening (with the blank screen), each line says:
PHP Fatal error: Call to undefined function get_input_value() in c:\xampp\htdocs\plugins\db_version\db_version.php on line 119 in db_version.php
I took a look at this file and line 119
if(get_input_value('_load_pm_settings', RCUBE_INPUT_GET)){
In the header of this php file there is the mentioning of
http://myroundcube.googlecode.com', so it seems these files have been downloaded to add plugins, at some point. From what I have read this site is gone and these plugins are not supported here.
Then I bluntly replaced the directory plugins with the one inside roundcubemail-1.3.1-complete.tar.gz file and the login screen reappeared again
and all
"seemed" well.
Now the following line is in the error log.
PHP Error: Failed to load plugin file C:/xampp/htdocs/roundcube/plugins/plugin_manager/plugin_manager.php in C:\xampp\htdocs\roundcube\program\lib\Roundcube\rcube_plugin_api.php on line 173 (GET /roundcube/)
I looked at the config.inc.php file and there is mentioning of the plugin_manager. Is it best to replace the following
$config['plugins'] = array('plugin_manager');
with
// List of active plugins (in plugins/ directory)
$config['plugins'] = array(
'archive',
'zipdownload',
);
from the file config.inc.php.sample to get rid of this error message?