If you are receiving the error for mod_security, access denied with error code 403 when you check the error logs for any account. You can disable the mod_security for that account by adding a simple code in his .htaccess

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SecFilterEngine Off
SecFilterScanPOST Off

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You should place the following lines in the .htaccess file to allow SSI directives to be included in the .html or .htm files

AddHandler server-parsed .html
AddHandler server-parsed .htm
AddType text/html html

If you are familiar with HTML and wants to modify the display format of your guestbook, then you can do this by editing the file at location .panel/web/guestbook/1
Just login to your control panel and goto File Manager => .panel => web => guestbook => edit the file named “1″. You will find all your guestbook entries there. If you miss anything then your gustbook will not show the data properly.

If ^M character showing up in files while opening that file in vi editors use the following step to Convert ^M to new line character

In vi use the following:

:%s/^M/\n/g

or with perl on the command line:

$ perl -pi.bak -e ’s/^M/\n/g’

NOTE: Be sure to create the ^M by typing ctrl+V followed by ctrl+M.

^M is ASCII 13 (Ctrl+M), which is the carriage return.

Different operating systems use different symbols to set the end of a line/new line.
Unix uses newline (\n)
Mac uses carriage return (\r)
And Windows/DOS use both (\n\r)

To prevent the ^M from showing up in files, be sure to use ASCII (text) mode when transfering text files.