Issue with the ID tag applied to Views blocks

Hi there.

I have an issue where the id tag assigned to a block by views looks something like this:

<div id="block-views-448504803dc9de46c9a87df990d604bf"... etc

instead of something like this:

<div id="block-views-feature_story_list-block_1"... etc

I've tried creating new block views and this seems to be happening consistently now, whereas I have some older block views that have the correctly formed id tag.

Needless to say, it's not a showstopper, but my css file will be pretty ugly :)

I'm not sure what info might be required about other modules/versions, but I'd be happy to provide it if it helps.

Thanks!