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:
Apparently Google has applied some kind of block for gambling keywords. Does anyone know of a setting that would get around this restriction?
I've tried that checking 'Include adult ideas' does not work.
Forum discussion at WebmasterWorld.