The problem is back and it's worse than before. I still have the Use Non-X view option selected, but it's become unusable. A simple count(*) on a table with 10,000 records takes about 5 minutes to complete. In TDP 3.8 it takes about 1 second. I have 3.8 and 4.0 installed on the same machine. 3.8 works fine, 4.0 not at all.
Also, in 4.0 when the query completes, it shows Duration: 0:00:01.606. However, it takes 5-10 minutes to display it. It's like the query is executing fine in Teradata, but the UI then hangs for a long time until it displays the results. This is also impacting my automation jobs which used to run in a few minutes, but now take 5x-10x as long.