Alex
Arcane
This is actually a really minor issue.
But I've noticed that some thumbnails for people's avatars that show up in the notification area seem to have some transparency issue,
Note how there are a few white pixels near the borders of both Blutwurstritter's and Wesp5's avatars. These don't show on the full sized avatar. Semiurge's avatar looks fine (well, looks gay, but that is another issue) despite having more use of transparency.
But I've noticed that some thumbnails for people's avatars that show up in the notification area seem to have some transparency issue,

Note how there are a few white pixels near the borders of both Blutwurstritter's and Wesp5's avatars. These don't show on the full sized avatar. Semiurge's avatar looks fine (well, looks gay, but that is another issue) despite having more use of transparency.