That'll be that corporate cache proxy server being a bitch again. That's probably the cause of the auto-complete thing not working too.
Nothing you can do about that unless you write a nice email to your IT department.
The right click thing. Hold Ctrl (or Option as you're on a Mac) when you right click and you'll get the browser default context menu. This is actually contrary to the default in CKEditor, which by default wants to stop you using the right click at all and use the build in Dictionary which is advertising sponsored.
And because they're hoping you'll pay for their cross-browser "SCAYT" or Spelling Correction As You Type, but why do that when there are free tools / built-in functionality.