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STMicroelectronics Virtual COM Port problem send big data

Question asked by evgen on May 19, 2014
Latest reply on May 20, 2014 by sung.chen_chung
I made VCP from ST sample on ST32F405 (STM32_USB-Host-Device_Lib_V2.1.0 & DriverVer=04/25/2010,1.3.1)

When I send data from CPU to PC less than 64 byte, all work fine.
I have 2 problems:
1) When I try send data from MCU to PC more than 64 byte, then some times data lost.
2) When send data = 64,or 128, or 192... ect. bytes, then data not come to PC (as I understand need zlp)
VCP driver from ST have bugs?
Somebody know how solved this problems?