Hello,
after installing Patchlevel 10 (SAP GUI for Windows 7.20) there was a problem in transaction FMBB.
After starting the transaction FMBB and entering data in the first line, and then copied to the next, after pressing the enter everything disappears. Please see the video where it is visible. Sometimes you can not enter even the first line.
Video showing problem, available here: http://vimeo.com/35252962
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K.