Reported at WebmasterWorld, it appears that the Google keyword tool is blocking displaying suggested keywords for some gambling related terms.

For example, if you try plugging in [casino] into the tool, Google will not suggest any other related terms. Here is a screen shot:

I’ve tried this being signed in as well and it made no difference.

I am not sure if this is a new thing, a bug or intentional.

One AdWords advertiser was upset to not be able to use the tool to find related keywords. He asked:

Any ideas?

Forum discussion at WebmasterWorld.