It is a new aspect of the calendar yes, as the calendar now loads events every time a new month is selected, rather than loading them all up at the start. This is to improve calendar performance, but in case there are a few events or the page load speed is slow, the ajax loader icon is there to let the users know something is happening.
To disable, add the following CSS to either your themes style.css file or a plugin such as My Custom CSS:
The support post ‘Ajax loader after updating Event Espresso Plugins’ is closed to new replies.
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Support forum for Event Espresso 3 and Event Espresso 4.