I didn't manage to find similar problem discussed anywhere, so I will ask here:
When my N900 lays flat on a desk and there is incoming call, there is Answer - Reject dialog in landscape mode. On my phone quite often "Reject" button is not next to "Answer", but below it and there is only thin line of it seen on screen. Both Answer and Reject are stretched full on screen. If I turn the phone to Portrait I have normal Answer&Reject button. Going back to landscape and Answer&rReject are shown just fine - one next to the other.
Have anyone experienced similar behavior? Possible causes and solutions? I have rebooted the phone just in case - same result.