I don't know whether this helps, but the way I start most applications
is with keyboard shortcuts I have defined, e.g. Ctrl-Alt-T for Terminal.
When I start an application in this way, and it is an application that
allows multiple instances of itself to be run (such as Terminal), I will
intermittently get two instances started at the same time. This is
merely a minor annoyance, but I don't know if it will shed further light
on the panel problem.
This said, the panel problem is not exclusively restricted to starting
applications using Xfce keyboard shortcuts: it occurred just now when I
opened this reply e-mail message within Icedove using Ctrl-R.
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