Answered
There's a problem opening files with LowerSum[] inside Sequence[]. Create an sequence
- lowersum = Sequence[LowerSum[x², i, i + 1, 1], i, 1, 5]
and save as ggb file. When opening the file Geogebra gives an error "Opening file failed". Despite the error message it appears to load ok, however the graphics 2 and 3d graphics views are broken, they appear as grey panes.
Example ggb file attached.
Tested in Geogebra 5.0.32.0, Java 1.7.0_40-32bit, Windows XP
The same problem 
Thanks, fixed in 5.0.35.0
Thanks for the quick fix!
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