Have you checked these first?
Help us help you: include your environment details. We've made this easy for you. Use the Copy System Info button in Admin Panel › osAwesome › Diagnostics, then paste below.
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Two quick checks before posting: try clearing your browser cache, and press SHIFT+O on any Staff Panel page to enter Safe Mode (a stock osTicket with no enhancements). If the problem still shows in Safe Mode, it's in osTicket itself, not osTicket Awesome. But let us know about the issue either way.
Help us help you: include your environment details. We've made this easy for you. Use the Copy System Info button in Admin Panel › osAwesome › Diagnostics, then paste below.
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Hi There, I'm currently experiencing a problem where i can't log into User Interface without deleting Cookies and Website data.
I already tried with Vanilla Theme and there is no issue, everything works fine.
The System I'm running osTicket Awesome on is:

Hi lizenz,
This sounds exactly like an upstream issue with osTicket itself that was discussed on this forum here and here.
But that issue was resolved with 1.17.1. If you're running 1.17.2 you should definitely not be encountering it.
Try editing include/class.usersession.php and replacing line 140 with the code on this page:
https://github.com/osTicket/osTicket/pull/6379/files
Let me know if that fixes your issue or not.
Hi Stevland,
thanks for your Reply. That solution worked for me. Strange that i've still encountered the Problem, even running 1.17.2...
Sorry, forgot to mark as resolved.