This is not an issue with Blesta, but likely something else with your server or installation.

Are you using the default en-us language that comes with Blesta? Are there any other language defines in Blesta that are not working? Can you look in the language file (../language/en-us.php) and verify that the SESSERROR1 and ACCESSERROR1 defines exist?

This is what I have for the language keys:

I am using the only language file which is en-us.php. No other language keys seem to invoke a problem, although I haven't really done a full test of all 1800plus keys. ;)

In terms of the server or installation, not sure what could be wrong there. Everything else works from e-commerce sites I host as well as CMS systems such as Joomla and Wordpress without any problem. Can you tell me what you think it might so I can correct them?

See here for a real time example:

http://goo.gl/L5r0w

(Shortened for obscurity by search engines as I don't want my site linked to this problem)

Tyson, I will be more than happy to give you access to the Blesta install if you want to poke around there and see what you think if that would help.

Someone had this issue before with language defines missing from the login page, but I don't recall exactly what the problem was, although I'm leaning towards something misconfigured in the config file that you created when you installed Blesta.

A couple common problems with the config file are incorrect paths to WEBDIR and ROOTWEBDIR, or saving the file in unicode or some other format rather than a simple ascii text file.

I'm drawing a blank at what else it could be right now.

Is register_globals on or off? If it is on, can you turn it off and try it again? register_globals is a setting in php.ini prior to PHP 5.4, and it's off by default in PHP 5.3, but a lot of people still have it enabled due to some applications not working without it.