Scheduled backup not running

[dsl101]

I've been using QTDSync in the following way for months with no problems, but recently it has stopped for some reason and I'm not sure why.

I have a scheduled backup every week, starting at 00:05 on a Saturday (i.e. just after midnight on Friday night / Saturday morning). I don't leave QTDSync running all week, but instead have a windows scheduled task which starts QTDSyncMonitor at 00:01 on a Saturday. In the past, this has been enough, and after 4 minutes of sitting there, Monitor starts the backup and all is well. On completing, I've configured a script to switch the computer off.

On the last few weeks, I've found the computer still on come Saturday morning, and no backup run. When I go in to manually run the backup, I get a message saying:

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Currently backing up
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The backup set <b>Weekly Backup</b> is marked as <i>currently backing up</i>!<br><br>It is likely that another QtdSync instance (e.g. QtdSync Monitor) is currently performing a backup.<br><br>However, do you want to force QtdSync to backup now?
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&Yes   &No   
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I get this every single time, and there's definitely no backup running. If I force it to continue, the backup runs and completes normally.

So, am I doing it wrong? How can I clear the 'currently backing up' status which seems to have got stuck somehow?

Tx,

Dave.

[dsl101]

Oops - sorry about that formatting! I just copied the content of the dialogue box :) I've tried to make it better...