When users are adding attachments to their posts they are met with "HTTP ERROR 500" Server unable to handle this request.
I have set up a directory in the root of C: and entered this into the "Upload file path" under "Edit project" the file path is as follows C:\temp\
I can see files in this directory see attachment "tempupload"

My config_inc.php section for the attachments is as the following

# --- Attachments / File Uploads ---
 $g_allow_file_upload   = ON;
 $g_file_upload_method  = DISK; 
# $g_absolute_path_default_upload_folder = 'C:\temp\'; # used with DISK, must contain trailing \ or /.
 $g_max_file_size       = 5000000;  # in bytes
 $g_preview_attachments_inline_max_size = 256 * 1024;
# $g_allowed_files      = 'jpg,txt,png';        # extensions comma separated, e.g. 'php,html,java,exe,pl'
# $g_disallowed_files       = '';       # extensions comma separated

(Note that "$g_absolute_path_default_upload_folder" is disabled in the above. If I enable it then I am no longer able to access the site)

See attachment "Check" For http://127.0.0.1:81/mantis/admin/check/index.php results

I am now stuck on how to get the attachments working and hope someone can see the fault. Please let me know if you require any further information from me.