Problems since upgrading to 1.6

The first message should go away if you refresh the page in the admin before you save the data. That message appears if the security nonce is stale, so it needs to be refreshed.

For your second point, I don’t understand what you are trying to do, can you share a link to the page so I can see it?

The second point has cured itself as my hosting server was going slow.

I have tried the refresh but does not solve my updating problem

This happens every time you try to edit a record? Are you using any kind of plugin that customizes the UI of the backend? This message is from WordPress, not the plugin, so it’s something outside of the plugin.

One thing to check is in your PHP configuration, try increasing the “post_max_size” setting.

This happens every time I try to edit or create a new member.

I have no plugin which customises the UI in the backend.

Here is my PHP config –
upload_max_filesize = 64M
max_input_time = 600
memory_limit = 256M
max_execution_time = 500
post_max_size = 64M

max_input_vars = 3000

I will try again deactivating all my plugins

You may want to increase the post_max_size value to 128M.