I moved my modified cforms.css and my-functions.php back from /cforms-custom to /cforms/styling respectively /cforms and the capital letters disappeared. But then i get an ajax error. Firebug output is:
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN"><html><head><title>404 Not Found</title></head><body><h1>Not Found</h1><p>The requested URL /wp-content/plugins/cforms/lib_ajax.php was not found on this server.</p><hr><address>Apache/2.2.14 (Ubuntu) Server at 192.168.178.23 Port 80</address></body></html>
Now in cforms.js i changed
var sajax_uri = '/wp-content/plugins/cforms/lib_ajax.php';
to
var sajax_uri = 'wp-content/plugins/cforms/lib_ajax.php';
.
Now the form works again and looks like it should!
But unfortunately my original form, which i built using 11.3, is still not working properly. For example when checkboxes are checked "-" is transmitted instead of "on". Could that have come through not properly deactivating/activating the plugin?