Can't write files to USB flash drive

From: cqdx (cqdx_at_discussions.microsoft.com)
Date: 04/30/05 

Date: Fri, 29 Apr 2005 19:21:02 -0700

Running XP Pro with administrator priviledges. I am not sure when this
started but, I can no longer write files or create folders on any of my USB
flash dirves if they are inserted after the computer has booted. If they are
already plugged in before boot, no problem but, if I then remove them and
plug them back in, I can't write files to them again. I can format the flash
drive. It seems as though there is some security at work here but I can not
find anything on it. Thanks, John