Here is a list of some possible bugs in 5.4.3. Correct me if I'm wrong Scream.

Line 19 of admin/template.php:
[Status] should be [U_Status]

Line 149-150 of approvepost.php:
U_U_Language should be U_Language

Line 205 & 208 of categories.php:
[Status] should be [U_Status]

Line 181-187 of editpost.php:
12 => is duplicated so references are wrong.

Line 565 of main.inc.php:
WIDTH="$width" should be WIDTH="$theme[tablewidth]"

So, are these right or not?

I think main.inc.php is okay as is in the instance you refer to (doesn't need to be changed), since $width is already defined as:

$width = $theme[tablewidth];

...just a few lines above that.