Jumpy Mouse when connected to monitor with Thunderbolt-to-miniDVI-Adapter

Hello everybody,
I have a Macbook Pro with Mavericks installed.
I've been working with a plugged in Packard Bell Monitor on my MBP for a few months now, everything went good.
But now, since yesterday, the mouse jumps all over the screen and it's really annoying!
I googled the problem and I now know that it's because of the Adapter I'm using, but it's strange.. I've had this monitor setting for quite a long time with no problems and now from one day to the other, there's this problem..
When I work only on the Macbook without a plugged in Monitor, it works normally and smoothly.
I even bought a new magic mouse because i thought it could be the external trackpad i'm using, but the problem is still here..
I cleaned my deck, cleaned the trackpad, cleaned my hands..
Sometimes the cursor moves only from left to right..
Do you know a way to fix this problem? Buy a new adapter? Buy another adapter? Buy a new monitor?
Thanks for your help!
BTW: Excuse me for my "not that perfect english" :')

Update.
Still having the problem.
I changed the mini displayport to displayport cable:
http://ca.startech.com/Cables/Audio-Video/DisplayPort/6-ft-Mini-DisplayPort-to- DisplayPort-Adapter-Cable-Male-to-Male~MDP2DPMM6
to this cable and am still having the same issue:
http://outlet.lenovo.com/us/en/itemdetails/0B47091/460/8FA0422CA6EA48B0BDED71D28 7F73673
I have heard that the issue may have something to do with the number of pins contained in the cable:Try another DisplayPort cable (One that is VESA compliant). Non-compliant DisplayPort cables may have snyc issues and may also have the # 20 pin pwr cable active. The # 20 pin is not suppose to be active and it may cause damage to your hardware.
The new Lenovo cable does not indicate if it is VESA compliant.
The main issue here is that after the Macbook Pro screen flashes blue upon waking, the screen brightness keys do not function. Only after removing the mini dispalayport cables do the brightness keys (F1&F2) function again.
Would really appreciate it if someone knows how to solve this issue?
Kind regards

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