I'm having this same problem. I tried what Benny suggested but it didn't work. LunarPages Support is taking too damn long to respond. Anyone have any other suggestions?
UPDATE: Tech support fixed it by making a blank .htaccess and filling it with:
AddHandler application/x-httpd-php5 .php5 .php4 .php .php3 .php2 .phtml
AddType application/x-httpd-php5 .php5 .php4 .php .php3 .php2 .phtml
Everything works now. Phew...