Command in terminal: Unable to work in 11.04

[H.S.Rai]

After upgrading to 11.04, I find almost difficult to work in console
mode. If I had a single file file.txt in folder Document, then on
typing (in bash shell)

ls Doc TAB used to complete it as:

ls Document/

and then further TAB used to display

ls Document/file.txt

But now "ls Doc" and then TAB used to complete it as:

ls Document SPACE

I have to press BACKSPACE and then type / then TAB to get:

ls Document/file.txt

The worst thing happen that I am unable to mv or cp file containing
space in filename. Earlier I used to escape space with \, now \
disappeared and space work without \ but command give error. See
below.

$ ls -trl F*.pdf
-rw-r--r-- 1 tcc tcc 19197316 2011-08-13 21:28 FOSS4G at EduSAT-2011Aug.pdf
$ mv FOSS4G at EduSAT-2011Aug.pdf ~/Documents/IIRS_OSM/.
mv: cannot stat `FOSS4G': No such file or directory
mv: cannot stat `at': No such file or directory
mv: cannot stat `EduSAT-2011Aug.pdf': No such file or directory

How to work in console mode. Do we need to re-learn agian?

-- 
H.S.Rai