If the saved templates in your files folder (the ones you save with the “Save template layout” function) are corrupted, do the following.
Close all open charts
Click on “Files > Open Data Folder > MQL4 > Files
Simplicity users: Locate the 3 template files (Simplicity YWY, Simplicity YYB and Simplicity YYR) and delete them.
Arc users: Locate the 2 templates files (Arc Scanner and Arc Analysis) and delete them
Open new chart
Apply one of the Simplicity or Arc Scanner template from the template folder