• I can't see correctly encoded characters in platform or learning object
  

edit config.php and change the following parameters:

$GLOBALS['db_conn_names'] = 'utf8';
$GLOBALS['db_conn_char_set'] = 'utf8';

to the appropriate one, for instance:

$GLOBALS['db_conn_names'] = 'latin1';
$GLOBALS['db_conn_char_set'] = 'latin1';

• I don't have enough space on my server
  

Delete these folders:

upgrade/
install/
xml_language/
readmelicense/

• E-Mail sent are wrongly formatted
  

open file config.php and edit this variable:

$GLOBALS['mail_br'] = ''\r\n'';

to

$GLOBALS['mail_br'] = ''\n'';

or

$GLOBALS['mail_br'] = ''\r'';

• When i'm using scorm object I receive error like: xmldoc has no proprerties or other "strange" javascript POPUP

First turn off the debug mode in admin area/config/config/main option

If continue to display error:

It's a server issue regarding pear inclusion (Experienced, for example, in xampp) Please go on doceboCore/addons/soap/pear.php and empty the file from all the code without deleting.

• Server become so slow and sometimes freeze when i have lot of connections

Maybe apache have some connection limit and generate this error in error.log:

[error] server reached MaxClients setting, consider raising the MaxClients setting

You have to edit apache configuration files and rise connection limit to 150 or higher.