If gab is functioning as normal but you're still experiencing difficulty, you can try clearing your browser's cache and cookies.
 
Be sure your browser is updated.  Log out of gab and close any open gab tabs that you may have open.
 
Note: Some older operating systems like Windows 7 may not be compatible with all the site features.
If you're having trouble logging in, uploading photos or creating listings, try turning off ad plugins or extensions, and make sure there are no issues with your internet connection.

For the most common browsers, the following links may help.  If you use a different browser, please check it's support for specific instructions.

Microsoft Edge
https://support.microsoft.com/en-us/help/10607/microsoft-edge-view-delete-browser-history

Mozilla FireFox
https://support.mozilla.org/en-US/kb/how-clear-firefox-cache

Apple Safari
https://support.apple.com/safari

Chrome (computer, mobile, ipad, iphone)
Browsers like Brave are chromium based and may have similar instructions as Chrome.
https://support.google.com/accounts/answer/32050?co=GENIE.Platform%3DDesktop&hl=en