# \[Solved\] Login error - Browser blinks but not load the panel

**URL:** <https://forum.mautic.org/t/solved-login-error-browser-blinks-but-not-load-the-panel/19700>\
**Category:** Product Support\
**Created:** [June 1, 2021, 11:15pm UTC](https://forum.mautic.org/t/solved-login-error-browser-blinks-but-not-load-the-panel/19700 "2021-06-01T23:15:31Z")\
**Posts on this page:** 1\
**Showing post:** 6

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**Author:** ![EJL](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.mautic.org/ejl/32/12155_2.png) [@EJL](https://forum.mautic.org/u/EJL)\
**Post date:** [June 2, 2021, 1:20pm UTC](https://forum.mautic.org/t/solved-login-error-browser-blinks-but-not-load-the-panel/19700/6 "2021-06-02T13:20:58Z")

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No problem! I think you are making the right move. Mautic 3x is light years ahead of 2x and 4x is right around the corner. I have a 4x beta instance with 50+ million contacts and it runs flawlessly. 5 installs of 3.3.x with 5-10 million contacts and they run flawlessly as well.

Let us know if we can help you transition from 2.16 to 3.x  
Check out [Issue after restore Database in mautic - #2 by rcheesley](https://forum.mautic.org/t/issue-after-restore-database-in-mautic/19706/2)

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