QB2003 paswords changed themselves

The answers weren't flippant. When confronted with a problem, one attacks it with the more likely causes first. In your case, the symptoms were caused (in order of likelihood) by:

1. Somebody maliciously changed the passwords. (99%)
2. Everybody simultaneously forgot their passwords. (

No chance someone thought they had a client file / sample file open and zapped the PW's in the wrong file?

Do so and on a computer not on your network if you have one. Then check it on a computer on your network. Curious to hear the result.

None of us asked, any thing that might point to hardware? Power surges, lights blinking, etc. No temperature extremes? Anyone trip over a network cable? Windoze server logs indicate any drive faults? You know the usual suspects when there are unexplained stuff going on with any file.

Other stuff not asked: Disgruntled client? Wi-Fi turned off? Hardware firewall?

Did you do a verify/rebuild on the file? If so what did it find? qbwin.log file.

1. OP is going crazy (10%)
2. OP is pulling our leg and incident is made up (20%)

1. OP eat tainted gazpacho during the 4th which caused dyslexia and now only thinks passwords are jumbled around. (Priceless)