Let’s first check the server settings to make sure you have everything up to date.
Reach out to your hosting provider and confirm if these requirements are in place https://www.imagely.com/docs/requirements/
1.- Temporarily deactivate all your plugins except NextGen Gallery.
2.- Is the problem solved? Then, it was caused by one of your plugins. Please check one by one and find the one causing the problem.
3.- If the problem is not solved with the deactivation of the plugins, try changing to a standard WordPress theme, it could be a conflict with your current theme.
Because it has been a month or more since your last reply, I am going to mark this as resolved as I assume you have found a solution. Please feel free to reply again if you still have questions. Thanks!
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