Weird Stuff with VS2005

[Joe Cool]

I use one of those flash drives to take backups of key files on my
work PC before I leave for the day and sometimes I make some changes
to these files at home and need to refresh the copy on my work PC when
I get in the next morning. It got boring manually formatting the flash
drive and dragging files to it, I decided to automate the process. We
use VS2005 at work so I wrote a quickie VB application.

It uses an XML file than can be edited by a form in the backup app to
specify which files and folders to backup and the name of the backup
device. It works like a champ. Here's the rub.

If I take the source code home and make some changes, then the next
day when I copy the changed files from the flash drive to the hard
drive, the OTHER copy of the EXE in my Program Files folder suddenly
stops working!!

ALL of the controls on the form refuse to fire their events. The only
control that works is the system close button, the little red X.

I can fix the problem by bringing the project back into VS, edit a
source file, hit the enter key, then the backspace key, ie, no real
change in the file other than last modified date and build the
project. Copy the new bin files to Program Files and it now works like
a champ again!!

What gives?!?!?