Originally Posted by demolition
You need to delete all the old files and start from scratch with the new core and corresponding files. If PAL interlaced works, PAL should work as well since its using the same output resolution just with line doubling enabled. Also, set your monitor scaling to aspect so it won't stretch the screen to wide screen. All the modes are working fine on my 2408WFP, so I'm guessing it should on yours as well.
Went back to the second config tool (the one that introduced the test button) as this works fine. Deleted everything and tried the new tool and resolutions are all out of whack, colours looked better though. Although the best result was with the from factory firmware except for the off centering when playing games.
To me the indivision ecs tool is a far better application.