thank you for using Image Source Control or giving it a chance.
Before you post a support question, please be aware of these things.
ISC is free and without a commercial background. I use the plugin of a lot of my own sites so I am highly motivated that it works well with the latest WP version. However, I am not able to test its compatibility with every theme or plugin out there.
The code is free and open source, so you are very welcome to submit your own fixes to me so I can include them in the main version as well. In case you need an urgent fix, I might be for hire.
The image source displayed within the image (aka caption source) in the frontend is the most fragile part in ISC. Sometimes it doesn’t work perfectly with every theme or other js code. In a lot of cases using the image source list at the end of the post is a more stable option.
I close issues when the original poster didn’t respond for two month.