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I've just upgraded to v110606 and immediately get a problem which I think is related to the class autoloader. On every page I get the following error:

Warning: call_user_func_array() [function.call-user-func-array]: First argument is expected to be a valid callback, 'c_ws_plugin__s2member_files::check_file_download_access' was given in C:\inetpub\wwwroot\wp\envirolink\wp-includes\plugin.php on line 395

I think this means the class c_ws_plugin__s2member_files has not been loaded at the time the hook is called.

Has anyone else experienced this problem? Is there a fix?

Haven't had anyone report this problem before. I'd try re-uploading the plugin, there's probably a something wrong with one of your files. You can follow these instructions: viewtopic.php?f=36&t=247

Yes! A reload did the trick. Many thanks Cristian.

That's great! You're welcome.