unity not working anymore?

Hello guys!
I was using unity, testing some stuff and everything went fine.
Yesterday I opened it and stopped working correctly.
Some of the things that aren’t working properly:

I can’t zoom in/out randomly (sometimes I can, sometimes I can’t).

If I open the island demo, everything shows alltothether in a small square (the size of the “sun” icon representing the light, for example) or it doesn’t show anything. Nothing shows up in Hieracy, but the project window is filled with everything from the islands demo. If i go to the “islands” icon on “project” and click on it, the islands show up, the camera is very far from the map, and scrolling down takes ages (not because it is too far, but because zoom runs very slowly, even though moving the camera on it’s own axis works fine).

I create a terrain on a new project, and try to Raise it, see what happens:

when I click to actually raise the terrain it looks fine:

but when I release the mouse button it looks like this:

both pictures are taken from exactly the same place and without modifying anything but the mouse click.

I’m really lost in this, I tried to uninstall/reinstall, but nothing happens. Also, I don’t know if anyone has been doing weird things with my pc since everyone washes his hands and says “I don’t know”. My sister told me that she installed some weird flash application from one of those crappy facebook games, but I don’t know what’s called and I don’t know if that could be the problem.
The truth is that unity was working perfectly and now it doesn’t…

any clues? thanks in advance!

Can you fix those image tags so we can more easily see what you’re referring to?

fixed!

Sorry, It’s been a long time since I’ve used imageshack and their new design gets me kinda lost :s

It will be fine when actually in game. I think it will look right if you zoom in as well :).

thanks!

now it seems to be working fine, this is so weird :s