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If you are using Caldera Forms with PHP 5.2 or PHP 5.3, and click the admin entries link, the loading spinner will not stop spinning. We are working on a fix, but this is not a problem with PHP 5.4 or later. You can see what version of PHP you are using by going to the Support submenu item and clicking on Debug Info.
You should also be aware that you are using an old, slow, and extremely insecure version of PHP. We strongly recommend contacting your host ASAP to get updated to a newer version (We recommend PHP7).
You can track the status of this issues
https://github.com/CalderaWP/Caldera-Forms/issues/1544