Hour meter no longer working

In my transaction groups I have an insert and update group. Both groups use the same OPC tag to function (e.g. Mill_Running).

After upgrading to 7.6.4 (OS = XP SP3), my update group never triggers because the Hour Meter never accumulates. The hour meter is an expression item: if(Running,0,1). The insert group works fine.

Changed expression item to float and meter started working. Manual states datatype must be integer or float? Data type prior to upgrade was integer.