The problem appears to be resolved. The graph on the dashboard now displays post visits for 05/02 & 05/03; it also displays the posts visited.

It occurred to me earlier – before I today opened the dashboard and ascertained the foregoing – that perhaps the problem was that the code in one of PVC’s files referenced a particular server and that an inordinate delay in DNS propagation to it of the new IP Address was the cause. The gap in reported visits commenced on 04/22 – on or about the day of migration from the old server to the Managed WordPress server – and continued through 05/01. Nine (9) days seems awful long for the propagation, but this is the only cause that presently occurs to me.

In any event, it now appears the issue is closed. Nevertheless, if anyone has any thoughts or confirmation on the foregoing, they would be most appreciated.