unzip -a strange behavior

[Dennis Wicks <wix@mgssub.com>]

Greetings;

I regularly use the -a option to unzip to fix DOS/Windows 
line endings and have never had a problem. Until yesterday 
and today!

Today it treated everything as a binary file and all the 
text/ascii files still had ^M at the end of each line. 
Yesterday it treated a pdf file as a text file and it was 
unreadable!

Any ideas as to what is wrong here?

Many TIA!
Dennis