I've just come accross a computer on which this behavious is evident and I think i've worked out why it's happening, but not evident on all computers.
The slides are set by a javascript timer which continually monitors the position of the video. It seems that in IE if Quicktime isn't ready and you try to call a QT javascript method, the timer itself dies and slide sync fails as a result. In other browsers, the timer keeps going when this happens and you just get a non-critical error message in the browser error console. QT is a bit slow to initialise in IE and I suspect a recent update to either IE or QT might have made the problem noticeable for a larger number of systems.
Either way, i've now inserted a bit of code which will cause the timer to be restarted after the page has finished loading, this seems to have fixed the problem for me. This is in the current dev code and will be included in the next release version.
The slides are set by a javascript timer which continually monitors the position of the video. It seems that in IE if Quicktime isn't ready and you try to call a QT javascript method, the timer itself dies and slide sync fails as a result. In other browsers, the timer keeps going when this happens and you just get a non-critical error message in the browser error console. QT is a bit slow to initialise in IE and I suspect a recent update to either IE or QT might have made the problem noticeable for a larger number of systems.
Either way, i've now inserted a bit of code which will cause the timer to be restarted after the page has finished loading, this seems to have fixed the problem for me. This is in the current dev code and will be included in the next release version.