SAN FRANCISCO—Twitter experienced a bevy of glitches for over an hour Monday as links stopped working, some users were unable to log in and images were not loading for others.

The company said “Some parts of Twitter may not be working as expected right now. We made an internal change that had some unintended consequences.”

Trying to visit Twitter’s help page Monday led to an error message that says “Your current API plan does not include access to this endpoint” and displays a link to a software developer page that also doesn’t work.

Twitter owner Elon Musk wrote on Twitter Monday: “This platform is so brittle (sigh). Will be fixed shortly.”

The company wrote on Twitter shortly after 10 a.m. Pacific time on Monday that it had addressed the issue.

According to Downdetector, users began reporting the outages shortly before noon U.S. Eastern time. Internet access watchdog NetBlocks said “Twitter is currently experiencing international slowdowns and outages affecting many users,” and noted that it was also affecting image and video content. Some users were not able to see the images that other users were posting.