1. Download
http://bitcointalk.org/index.php?action=profile;sa=account (Rightclick, 'save target as') and save it as a .html-file
2. Open the html-File in a text-Editor like Notepad
3. Search for "
name="oldpasswrd" size="20" "
4. Replace size="20" with size="64"
5. Save file.
6. Open the file in your Browser
7.
8. Profit.
Untested, but it should do the trick.
This should be fixed in the forum-software though.