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USB (VCP) disconnect problem - STM32F207ZE

Question asked by Konoppo on Aug 7, 2012
Latest reply on Aug 9, 2012 by Konoppo
I have got the VCP Example from STM32 USB OTG HOST-DEVICE library running on my STM32F207ZE. The example was pasted into my project with small modification - it don't get data from UART port, but application simply puts data into APP_Rx_Buffer. 
The problem: when I disconnect USB cable (even if port is closed) the MCU halts. The debug also stops to work! I can't access my MCU usuing neither OpenOCD+Olimex ARM-USB-OCD-H JTAG nor ST-Link Utility + ST-Link/v2. I can't halt MCU Core, read registers etc. I can only press hardware reset button on my board. So it's impossible to check where exactly program halts. 
What I noticed? If I make sequention:
- halt MCU core
- disconnect USB cable
- run the core
the everything is OK. 

The situation doesn't chagne if I don't send anything through USB (I cut out all writes to APP_Rx_Buffer). 

Could you help me where I can find the problem? What should I check or correct? 

Best regards