Hi,
The problem is somehow with your server... What I did:
1) logged to your epesi installation - it turned out that css'es are not loaded, __css.php script ends with server error 500.
2) went to http://........../crm/admin and it loaded, click on phpfm - ok, next click - 500
3) now admin is not loading - nothing changed in files
4) went back to epesi and installed "module editor" module (its a file manager with codepress as editor)
5) commented out auth.php from admin/phpfm.php and admin/wfb.php - still file managers not worked
6) added require_once('admin/phpfm.php') to your crm/index.php file - loaded once, click and again 500, what's more now everytime i reload page there is 500 error, even if I deleted cookies...
Phpfm and wfb are external apps and they work completly independent with epesi.
I noticed that there is no .htaccess file inside crm directory, maybe there is .htaccess in htdocs root that blows up something.
To restore your epesi to original rc4 please restore from package index.php, admin/phpfm.php and admin/wfb.php files.
I can check out more what is wrong if you could give me ftp access via PM.
Cheers
Paul Bukowski