I had the same problem. The reason is that Eclipse is not fully configured - some background tasks ( freezing ) were performed .
Try running Eclipse with a different version of the JRE. I have this problem with 8u60, but everything is fine (as far as possible with Eclipse) when I use 8u45.
Disable Theme - I highly recommend that everyone stop using Eclipse and switch to Intellij IDEA. Your life will be much happier.
UPD I again ran into this problem with a new workspace, so maybe it's not about the JRE version. Try to wait a few minutes, open the workspace again, it worked for me.
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