• We’re currently investigating an issue related to the forum theme and styling that is impacting page layout and visual formatting. The problem has been identified, and we are actively working on a resolution. There is no impact to user data or functionality, this is strictly a front-end display issue. We’ll post an update once the fix has been deployed. Thanks for your patience while we get this sorted.

DotNetNuke

My guess would be file permissions. Make sure the account that's uploading the images (either the app pool identity, IUSR account, or ASPNET) has read/write access to the directory.
 
If user permissions haven't changed since you started, then you might want to check that you haven't exceeded some upload limit and have enough space available on your server.
 
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