CMSimple Classic ver. 3.52 is available for download at http://cmsimple.p2pnation.eu/
Thanks to the help and good advices from Christoph xsrf protection is now fixed so it works together with Oedit. Plugin loading is switched back to the original way where all plugins in the plugin directory always are loaded.
CMSimple ver 3.4 and CMSimple Classic ver 3.5 and 3.51 should be updated to the new version 3.52.