Got the mail and already see what cause the problem.
Is a older bug related with GDI, related to big size animated GIF, and is really hard to solve.
As a solution instead of waste time to address this issue with animated GIF (at least in the near time), I add soon a image decoration VIDEO object, what for sure open the possibilities to do more nice things than a simple animated GIF and is more appropriate for complex or large animations.
Until that happen there is a simple workaround if this happen to you again or to any other user and template is locked. All what do you need is download this GIF (right click and choose save image as)
Rename this GIF to original name of your animated GIF (if template use multiple GIF then create multiple GIF using this provided), then place and replace original GIF files if already exist in the folder:
Documents > Chameleon > Config > Tmp
Now you can load the template, template works, delete the images decoration cause the problem.
Create a new decoration images, with optimized GIF.
In your case, already sent optimized files to you, check your mail, place the files I send to you.
I optimized using a online tool, in your case i reduce the size of GIF with value 60.
https://ezgif.com/optimize
If want a permanent fix in of your template, delete the decoration images, crate again using the provided images, or optimize your images.
Finally we not have a rekordbox template, if you can be nice share your template with that community with all documentation.
You have no obligation to share it, but it would be useful to other users.
Please confirm all is ok now.