I noticed that when the cursor enters an equation, the math toolbar does not pop up as in the qt3 frontend, rather, parts of it appear over the menu bar. Before you ask, this is not specific to cygwin, as I observe it on solaris, too.
I don't know if this related to the crashes I get on cygwin when scrolling a document, as I don't get them on solaris, but there is something fishy going on here. -- Enrico