Client Juian Gomez had good video except for s-curve distortion of lines toward edges of screen. Found exact model on list (Mag DX 715t). Used documentation and monitor controls to try to adjust, no success. Thought it might be sync prob in monitor, but worked fine in Windows. Freq settings from Maginnovision site fixed it (50-160 HZ vertical; 30-86 HZ horizontal), apparently server settings were wrong.
fixed in Xconfigurator-4.2.8-2 and later.