Shoutbox

This issue has been going on for quite a long time now, I've seen other users ask this question before, but it doesn't seem to have been resolved for some odd reason.

Issue: When I log my chat conversations(encrypted with a password), it will save as usual for a certain amount of time, then after - will continue saving chat logs without a password(meaning anyone can view it). I'm strict on privacy, because their are many users here that use this PC.

Tried: 1) Creating a separate folder for my Encrypted Chat Logs, and I get the same result as mentioned in the "Issue" section

         2) I've also created a password, so that no one can alter my preferences, and still ends up with the same result.

Considering: I'm considering doing a clean uninstall and reinstall, however the previous user(s) that have tried it mentioned that it failed.

Temporary Fix: The only temporary fix for this issue seems to be, to re-password my Chat Logs every time it decides not to, and click apply(which in fact is quite annoying).

OS: Windows Vista x32
MSG Plus Version: Messenger Plus! Live 4.23.276

Any tips/suggestions/advice or even a simple answer would be appreciated.
Thank you in advance!