If the Captcha is not working right or has missing elements, try these things:
NOTE: Are you using any ad blockers or script blockers? If so, that may be blocking the Captcha.
Otherwise, here's how to troubleshoot:
First, simply refresh the page in your browser and see if that changes anything.
If not, then log out and clear your browser's Internet cache.
Close the browser and reopen it.
Make sure cookies are allowed/enabled in your browser settings so the Captcha will appear.
Log in and try again.
If still unsuccessful, do all the above, then this time open a private window/private browsing (aka "incognito mode").
Log in with the private window (again making sure cookies are allowed) and try the e-file again.
Or see if trying a different browser (with cookies allowed) will solve it.