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I'm not sure what you are doing. Creating private tickets with SEF enabled does work just fine. In fact, you verified that the redirection does work. It's the same line of code always, the one you said it works with non-SEF URLs. It's Joomla! –or your SEF extension, if you're using any– translating the non-SEF URL in setRedirect to a SEF URL. So, what you are describing isn't happening but I have a suspicion on what is going on.

When you submit the ticket does the ticket actually submit? That is, do you see the new ticket in the tickets page even though "the screen stays in the same spot"?

- If you do see the new ticket the problem is either in how Joomla! handles SEF routing or your browser. Try with a different browser. If the problem persists most likely you've created a new item for submitting new tickets. In this case it is normal to return to the new ticket page BUT you should have a success message at the top and the ticket submission form should be blank (not "stay[ing] in the same spot").

- If you do not see the ticket then you have a Javascript issue caused by a third party extension. Most likely they've done something funky trying to load the Javascript or ended up creating invalid inline Javascript code. Using your browser's Javascript debug console should give you more hints on the nature of the issue.

Our own site does redirect to the tickets view. This is done in lines 323:325 of Controller\NewTicket.php. The only reason to be redirected back to the NewTickets page is hitting lines 205:206 (Ticket validation failed) or 220:221 (Ticket creation failed) or 296:303 (Post creation failed). In these cases the NewTicket view would be populated with your ticket data, not blank.

That said, you'll notice that the regular redirection (lines 323:325) do call getItemidURLSuffix which appends the Itemid (menu item ID) to the URL. As I said in my previous reply if you have a menu item pointing to the NewTicket page and you are using it to file new tickets then the redirection will most likely lead you back to the NewTicket page. That's because the Itemid in the URL points to a NewTicket view, therefore the SEF router will create a SEF URL valid for the NewTicket view. Unfortunately that's a side effect of the convoluted way SEF routing works in Joomla! :(

The only workaround is not creating menu items to the NewTicket view. Instead have menu items to the categories or the list of categories and let users click the New Ticket button there (that's how our site is set up). In this case you can copy the SEF URL of the new ticket page for each category and create Link menu items with this hardcoded relative URL. For example, I'd create a Link menu item with the URL /support/akeebatickets/new to show you the new ticket page for ATS support (https://www.akeebabackup.com/support/akeebatickets/new) on our site. I know that this sounds sketchy. Welcome to the wonderful world of Joomla! SEF routing that's claimed the sanity of many a developer...

What you describe is definitely a third party extension screwing up the Javascript. Try using the browser's debug console. For example, for Chrome: https://developers.google.com/web/tools/setup/workspace/setup-devtools