this problem comes and goes when I wake the laptop from the sleep mode,,,it looks like the Space button is on hold BUT FROM OUTSIDE IT'S NOT !!! 
I don't know how to say it but I filmed it..
check it out..
1)- when I open a list, it disappear suddenly,,,
http://www.youtube.com/watch?v=ru5LuD8rxfg
2)- if I open a folder and scroll thru it, it suddenly brings me back to the top of the folder, I can open another folder from the first one ONLY if I use the arrows and O⌘,,,
http://www.youtube.com/watch?v=cqmKQ5vod34
3)- when I write anything anywhere spaces appears,,,
http://www.youtube.com/watch?v=Dq3W-NivSEY
I hope that someone has an answer
and forgive me for my weak english & the quality of the vids.
I don't know how to say it but I filmed it..
check it out..
1)- when I open a list, it disappear suddenly,,,
http://www.youtube.com/watch?v=ru5LuD8rxfg
2)- if I open a folder and scroll thru it, it suddenly brings me back to the top of the folder, I can open another folder from the first one ONLY if I use the arrows and O⌘,,,
http://www.youtube.com/watch?v=cqmKQ5vod34
3)- when I write anything anywhere spaces appears,,,
http://www.youtube.com/watch?v=Dq3W-NivSEY
I hope that someone has an answer
and forgive me for my weak english & the quality of the vids.