Odd behavior -> it worked yesterday but not today

[remus]

Ok here is a good one. I have been working for several months with a few 
scripts that I am coding for a new site. The scripts have  been working just 
fine until I rebooted my workstation last night.
Today, the scripts are not working I kee getting this message: 

Name "main::DBI" used only once: possible typo at ./RE5i.pl line 6 

There are not changes in the scripts. I am puzzled here. 

Please help! 

thanks 

-Max