STM32F105: USB host failure

Hi to all,
I am trying to build a USB host application based STM32F105 using USB stack by Keil
(RL-ARM 4.13 (USB Host Mass Storage Class Interface). But I can not even run the MSC demo - fopen() always returns NULL. Besides of it, the USB stack does not recognize mass storage devices bigger than 1G!
Does anyone have any experience with this software package?
Regards
Alex

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