PROBLEM Save Updates button in admin leads to 404

[frixelsolutions]

apparently /admin/changedata.php is a 404, but I clearly see the file. Tried updating from old 3.x to latest version and it didn't help. This is only a problem when saving edits to pages, if I go to Settings page, and Save Settings, it works OK. Just moved this site to new server and it works perfectly otherwise. Thanks.

[shawn_a]

Its mod_sec not gs blocking your requests as they appear to be xss attacks