terminal characters

[Verde Denim]

I'm a bit baffled by this -
I'm running 8.04LTS 64-bit
When I type into a terminal, I either get black rectangles where the
characters should be, or i get blank spaces, but once I hit return, the
commandline shows what I typed in plain text.
Has anyone seen anything like this before? I've been running Ubuntu for a
while now, and haven't ever seen this type of behavior. While I don't make
mistakes in typing the commands that often,
it is really irritating not to be able to see what I'm typing (especially
for commands like mencoder). I've even noticed it will behave the same way
within vi...

Any input is appreciated.

Jack
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