What mod or options did this?

After a year of playing, what feels like a really dumb question...

I've been running with an increasing collection of mods since shortly
after WoW launched in Europe, and on the whole I know the ones that I
use fairly well. A couple of weeks ago, following a Windows BSD, my
SavedVariables files were corrupted to the extent that I was
eventually forced to delete the entire folder and reconfigure
everything from scratch. Everything's now back the way I like it,
with one small, annoying difference that I can't seem to sort, no
matter where I look.

Before the crash, the icons of other party members were vertically
grouped rather more closely together than they are now - so either I'd
managed to tweak them closer together before, or I've managed to tweak
them further apart now. It's more than an aesthetic thing; I play
healing classes quite a bit, and having everyone that I need to scan
close together on the screen is a definite advantage to my doing the
job well and comfortably.

Does anyone have any idea what add-on or option might have let me
affect this? I've been through every configuration option of
everything that I can think of, and so far I'm still coming up blank.
I'm running the following:
- Cosmos (some components only)
- Auctioneer
- Informant
- Gatherer
- CT_RaidAssist (solves the problem for me, but only in raid)
- GroupCalendar
- Decursive

One thing it's *not*, is a simple resizing of the UI via the Video
Options menu - I have screen grabs from before and after that show the
icons and bottom bar to be the same size.

If anyone has any ideas what might be making the difference, I'd love
to know - I'm tearing what's left of my hair out on this.

Cheers - Ian