The "Link To" field in qCalendarview will not display the URL correctly if the URL in the "Link To" field contain space. The final link will be prepended with %25 just before the space within the URL and this cause the page is unable to load.
TitleLink To in qCalendarView will display when URL contain spcaes
CauseThis is a product defect in the current version of QuickApps for SharePoint.
Put in the exact URL in the "Link To" field.
Waiting for fix in the future release of QuickApps for SharePoint.