[Problem]
Sometimes the 3d engine freezes, but not totally - you can zoom in/zoom out, everything looks like a still frame, but you can't rotate or anything. The other symptom is, that the 3d engine runs normally, but all the 2d interface buttons including the chat window freeze and do not work. In the worst case, tho rarely happening, the game freezes at a whole. Usually after about 1 - 2 minutes, the game recovers by itself.
[Solution]
Open the taskmanager (cmdline 'taskmgr') and right click on the eve online thread (Exefile or something was the name). Set the CPU affinity to only use one CPU. I have only experienced this on dual core CPU's, so i guess the error is somewhere in that corner. This should fix your problem.