Since the New Launcher and the new Versions 1.6.1 and 1.6.2, Minecraft can't write:
ä ö ü ^ ´ ß € and other umlauts/keys
Linked issues
is duplicated by 51
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Comments 65
Same here on OS X 10.8.4 in both, window mode and fullscreen.
May be related to MC-22033
I am having the same problem on mac with icelandic keyboard (the letters: í,ó,ú,ý,é,ð,þ,æ),
for me, Minecraft seems to be unable to detect my keyboard correctly and it is like I just have a US keyboard not icelandic
Works in windows
I am able to type characters that appear in one go, like option-c for ç. If I set my keyboard to German I can type ü just by hitting that key. However, to type ü using my normal Dutch layout I must hit option-u (which puts an umlaut on the next character) followed by u. In Minecraft the first option-u does nothing and the u just types a u. Likewise, the Unicode hex input (where typing four consecutive hex digits, holding down option for each but not necessarily in between, inserts that code point) doesn't work.
In all of this, fullscreen or windowed doesn't appear to matter in the current version.
Based on recent comments, this sounds like a duplicate of MC-6436.
Confirmation in MC-21473 by [Mod] Anon Ymus