Issue
On Dashboards, when adding a new Performance Analytics widget to a Dashboard's tab, the Widget Picker will get stuck loading content.
Cause
The issue is caused by having a special character on the Name, Lookup Name, or Description fields of a Performance Analytics Widget.
The special characters include but are not limited to % or [ or any other invisible character.
This usually happens when one of the fields is populated with a text that has been copied from a PowerPoint or Word document, or other modern text editors. The "string" that gets copied contains special characters that are not rendered, therefore these special characters are not visible when generating the Performance Analytics Widget record. However, the special character doesn't allow the platform to properly query and capture all the widgets to show in the widget picker, causing it to be stuck while loading its content.
Resolution
The value of the Name, Lookup Name and Description fields of the Widget(s) causing the error needs to be deleted and updated with a pure text value. Also, while naming the Widgets, make sure not to use % or bracket [ ].
