[report] umenu create a blink at the border

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hello community,
a little bug report on my mac (osx10.6.8, mbp mid 2011)

Max Patch
Copy patch and select New From Clipboard in Max.

when i clic on the umenu, the jit.window@border 0 blink on the space of the border (on the top)
does everybody have the same problem ?
i try with antoher screen in dual view, but the problem is the same on the videoprojector...
bye