Resized versions of an image need to be in the same file format as the original, or at least in a format which has the required features (e.g. transparency).

The logos of Creative Commons recently uploaded by fajro to omgmg have bad thumbnails, because the original images are in PNG format with transparency, while the thumbnails are JPEG. The black-on-transparent logo became black-on-black, and the white-on-transparent logo became white-on-white.

Currently media deletion happens like this:

1. Go to media page.
2. Click "delete".
3. Check the "I am sure" checkbox.
4. Click "delete permanently".

If the checkbox at step 3 is not checked, you are back at step 1 (the media page appears untouched).

MediaWiki and file managers do it differently: you don't have to use a checkbox, but only click another button.

When the checkbox UI is used, but the deletion is cancelled due to the checkbox being unset, a message should appear to the user, or he might think that the deletion simply failed.

P.S.: I suppose that checkbox is there because people used to deleting (or running a bot) may click through many buttons and accidentally delete stuff. However, when everything uses a checkbox, it will just slow deletion down and make the user get used to that longer path. There should probably be a way to delete larger arbitrary groups of media quicker, at least where it is possible to upload large amounts of media.

not a big deal, but one of those things to account for eventually.