SDU mismatch error in SQLDeveloper

Hi,

Apologies for the lengthy explanation of the issue.

1. Using SQL Developer with a new connection to this database instance. (pic1)

          

2. I get this message after it has closed the session when I run a sql statement in a worksheet. (pic2)

3. Running a sql statement in a worksheet.   This happens running either statement below. (pic3)

4. Here is the Logging Page from the above window. (pic4)

5. All other objects for each database connection listed under the connection do not work and when I click on them I get the below error message, you can see in the window below that for each of the objects  I have clicked on without a + sign next to it they list nothing and I can click on every object with the same result as the last one shows Other Users without anything listed and you can see there are users in the query ran on the server below which also runs on the client in a dos window