I can confirm the effect with "LibreOffice 3.4.1 RC1 - WIN7 Home Premium (64bit) German UI [OOO340m1 (Build:201)]", 90° text and 180° text will be misrotated (0°) after document has been saved as .pptx and reopened in LibO.
Unfortunately my Powerpoint Viewer will not open that document, and also my pptx to ppt batch converter fails.
OOo-dev 3.4 also showed exported document with rotation 0°
I can confirm the effect with "LibreOffice 3.4.1 RC1 - WIN7 Home Premium (64bit) German UI [OOO340m1 (Build:201)]", 90° text and 180° text will be misrotated (0°) after document has been saved as .pptx and reopened in LibO.
Unfortunately my Powerpoint Viewer will not open that document, and also my pptx to ppt batch converter fails.
OOo-dev 3.4 also showed exported document with rotation 0°
Modified Status due to facts