This happended to me and my sister´s PCs:
When you want to create a new account from the Game Interface just after starting, you can´t use the @-sign for your e-mail adress.
I guess the problem is that on english keyboards there is a standalone key for this symbol, in Germany whe have to press the other ALT-Key and Q.
This Key-Combination will be ignored.
I helped myself with ALT and then 064 on the Numerical Block.
With other ALT-key I mean the right ALT-Key from the space bar, in Germany called ALT-Gr, I don´t know how it´s called on an QWERTY-Layout.
Pasting symbols from Windows´ symbol mapalsodoesn´t work, only the Num-Block workaround.
This is especially annoying when trying to write lua scripts because it's not possible to write characters like [ ] { }. I also had to use ALT+ASCII shortcuts.
So, Right-Alt-Combinations don´t work in the whole game?
Switching to english keyboard language under windows also doesn't work, but copying special symbols and pasting them with Ctrl-V fortunately works everywhere!
For all thos people, who can't insert special symbols:
There are two ways to do it, (a charmap is helpful).
(Windows users: charmap.exe)
1st possibility:
Get the ASCII-Code of the symbol you want to insert (charmap) and then hold down ALT and press the ASCII-Vaule on the numerical block (NumLock must be off), then release ALT.
Note that the ASCII-Code you enter has to be 3 digits, so you have to fill the front with zeroes.
For example, to get the @, which ASCII-Code is 64, you'll have to enter 064 when holding ALT or
for Tabulator, which ASCII-code is 9, you'll have to enter 009 when holding ALT.
2nd possibility:
Copy the symbol from somewhere else (charmpa again or another text containg the symbol), then perss Ctrl-v to insert it.
Note that the LUA-editor can only paste text by ctrl-v at the END of the script, not inbetween :(
closing this info should be in the wiki and will appear in searches not happening to anyone else