Having similar issues!
I'm having similar problems using DW8 and DA 2.0.6.!!!
Thought it was me so created a simple example of tables and pages and followed the video tutorial to the letter just to test the theory. My update page doesn't even update! Nor does it redirect - just refreshes the page with the original data still intact. I'm using a simple recordset and trying to update a single text field in each record.
Am still baffled as to why WA use the DW "Repeat Region" server behavior for some multiple operations (ie Insert multiple records) and the DA "Repeat Selection" for others (ie Delete & Update multiple records).
Over the past couple of weeks I've had a few problems with DA and, to be honest, I'm fast losing patience with it all!!!
Help! Advice please - or tranquilisers!!!