Some client does not allow space in guild names. There is plenty of way to fix it. In my case, im going to fix the client itself by editing it using hex editor.
Here are the step:-
- Open your hexed with a hex editor and search for this hex:
6A 20 53 FF D6 83 C4 08
Replace for
6A 21 53 FF D6 83 C4 08
The 20 hex above is the space string (” “) , I changed it to “!” and If you want change to another just put the hex code in that position.
P/s : Tested on client 2012-04-10 and it work great!