We're running Pentaho 6.1. After installing service packs thru SP201710-126.96.36.199 some reports now hang after the UI greys out with the circular action icon rotating forever (pointed to by red arrow). Here is the sequence of events: the complete UI paints as expected. Then it immediately re-paints and greys out with the error message shown under the red arrow. Because everything is greyed-out you can't click the OK button, so it hangs without ever writing anything to the logs.