i've included two screenshots to help explain the issue better.
the first one shows the new theme i've been working on for roundcube on my servers. it is in the "compose mode" as though i am in the process of writing an email.
if, while i am in this state someone writes an email to me, the screen will go blank, erasing anything i've typed and leaving me with nothing visible (as can be seen by the second screenshot).
what might be causing this? i am simply at a loss to explain/solve it.
thanks for any suggestions/help.