It's not a glitch in the Matrix—just an issue with updating.
The Kora app updates live. That means within any given day, platform updates, bug fixes, new features and connections—they're all pushed out in real time. On the plus side: this makes Kora super-responsive to user issues. But one drawback is that previous versions of the app sometimes seize.
Avoid app issues by making sure you're always using the latest version.
If the app is behaving strangely, or you can't get something to load, go ahead and close out of the app. Then download the very latest version of Kora. Open, and see if this doesn't solve your problem.
We know this seems very "Did you unplug it and restart?"—but app updates resolve many frustrations!