Hi @tmeehan,
Probably the JavaScript file is included without a version that would serve as a cache buster and avoid such problems. Check the getting started instructions:
<script src="_content/Radzen.Blazor/Radzen.Blazor.js?v=@(typeof(Radzen.Colors).Assembly.GetName().Version)"></script>
The v=@(typeof(Radzen.Colors).Assembly.GetName().Version) expression changes with every version and effectively prevents caching issues.