Background
When a javascript error is thrown, it prevents further javascript from being executed.
The Problem
If another plugin or your theme throws a javascript error before UberMenu’s javascript has been executed, it will prevent UberMenu from functioning properly.
Identifying the issue
Check your javascript console. If a javascript error is printed there, take a look at the file it occurs in, which will identify the relevant theme or plugin in most cases. If the issue occurs in an UberMenu script, it’s likely you have a jQuery version issue.
The Solution
You’ll need to resolve the javascript issue with the other plugin or theme so that UberMenu’s javascript can execute and function properly. Since this issue is not related to UberMenu, there’s no way to offer a suggestion as to what the solution might be; it will depend on the error.