Second monitor overlapping main monitor

[deckard97]

Hello,

Remoter VNC (latest as of today) on latest iOS7 (latest)
Screen sharing on OSX 10.9.4 Retina MBP with second monitor, TripleHead2Go (3840X720)

As I'm connecting, OSX wants me to login too but the second monitor is actually on top of main monitor so I can't see what I'm doing. The second screen is actually blinking a bit, I guess with the VNC refresh?

Anyone knows if it's a OSX or Matrox or Remoter problem?

Cheers!