[support] Block cache doesn't play nice with my module

[Scott]

On further testing of my new module I've discovered that for anonymous
users strange values are being displayed in the generated block.  I've
determined that this is due to block cache.  I turned it off on my
production version and it seems to be functioning correctly.  I did not
have this issue on my development box.

As with my earlier problem with css for anonymous users, I would
appreciate any thoughts on how I might deal with this.  The vast
majority of visitors to this site are going to be anonymous.

Thanks