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History: Ogre iPhone FAQ

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            !!Issues and Troubleshooting

!!Viewport::SetOrientation must be called after a frame is rendered to take effect. For example to change to {MONO()}Viewport::OR_PORTRAIT{MONO}:
{CODE(wrap="1", colors="c++")}mRoot->renderOneFrame();
mCamera->getViewport()->setOrientation(Viewport::OR_PORTRAIT);{CODE}

!!Q: I get error "OGRE EXCEPTION(7:InternalErrorException): Cannot create GL vertex buffer in GLESHardwareVertexBuffer::GLESHardwareVertexBuffer" when I try to load meshes, how can I get rid of this ?

It seems that the GLES render system can't create buffers just before rendering one frame.

Verify that your load() methods are not in a method called just before the rendering of a frame - methods like frameStarted(). 
On the other hand, you can load your meshes just after the rendering - methods like frameEnded().

Out of the rendering loop, GLES seems to not have that problem.