If you have issues and inconsisent data when retreiving historical data with Dashboards and you are using:
client 2.3 PL1 Dashboard connected to a
9.0 SMP which has all 8.5.1 DSAs.
The issue may be due to version incompatibility with SMP 9.0 and DSA 8.5.
DSA 8.5 only sees 15 minutes of 1-second data before the data becomes unavailable.