This app just shows the error "Imgur is temporarily over capacity. Please try again later." This happens when a particular proxy is being actively blocked. Images accessed with different proxies show just fine. So you may want to change your proxy.

Edit: I upped to 3 stars because this is going to be a running battle for the developer. Imgur is actively blocking certain VPNs and proxies (https://www.reddit.com/r/PrivacyGuides/comments/tg9new/imgur_blocking_vpns/), and users will have to adapt accordingly.