Hi Gideon,
> I added the bookmark widget to a web mapping application created in Portal for Arcgis and added some bookmarks, however when accessed from another PC all the bookmarks which were created don't show up.
Based on your description and mention of "widget", I believe you are referring to Web AppBuilder for ArcGIS within Portal for ArcGIS, and using the Bookmark widget.
FYI, when you create new bookmarks using the Bookmark widget, the bookmarks are only saved in your web browser cache. So the behavior you're seeing is expected.
As a workaround, I suggest you define your spatial bookmarks as a property of the web map. E.g., Set these in the Portal Map Viewer - these bookmarks will persist in the Web AppBuilder app when opened in different web browsers.
Hope this helps,
