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USB CDC VCP stm32l0 problem

Question asked by snufus on Feb 10, 2015
Hi all,
I'm developing a project on STM32L052C8 that use USB with VCP class (internal 48 MHz clock enabled)
The board is right recognized from the PC with ST driver "STMicroelectronics Virtual COM Port", and the terminal can connect to my device. When I send a short message to the device it is received correctly, the second message block the terminal and it is not received from the board.
With USBlyzer (attached screenshot) I saw that the second message sent does not have any reply and it is the point where the USB is freezed and not working.

I also try to create a simple STM32CubeMx with only a USB FS CDC class and upload on the STM32L053-Discovery and it has the same problem.
Many thanks