[OS X TeX] PDF-window in TeXShop: buttons lost

[Daniel Becker]

Dear all, 

in the most recent TeXShop (2.28, came with MacTeX 2009), the PDF-window from time to time (but often, happens several times a day) looses all its buttons. I put a screenshot at 
http://www.wiwi.uni-rostock.de/~wsf8545/images-static/tsbuttons.png
Quitting and then reopening of TS seems to help usually. 

Is this only happening to me? Any ideas?

Daniel



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