Follow this thread for info about what settings you need to turn off to enable maps and scanning:
http://myeve.eve-online.com/ingameboard.asp?a=topic&threadID=994372The scanner window sometimes collapses in on itself - and it looks mashed.
Expand the window and resize the sections - it's usually due to having the window too big and not enough probes out.
Don't trust the signal strength - just because it's 100% doesn't mean it's warpable. You need 3-4 probes to get something that's warpable.
When you can warp it'll be a small green filled circle.
If you see other small filled circles (yellow/red) then it's just a helper to know where to focus your efforts.
If you see a red circle (see images above) then it means you have 2 probes covering the location - but it's not enough to give you precise details of it's location.
3-4 probes are needed to triangualte the position of the signature.