iPXE hangs on boot from pxelinux at first Ctrl-B

[Gelip]

I build iPXE 10110009.rom for VPC 2007 & 10222000.rom for VMware pcnet32. Next inserted this to BINRES 13502 (VPC) & 6010 (VMware). Now test it with PXE server: TFTPD32 + pxelinux.0. The problem occurs only when I use Ctrl-B at the first appearance statement: Press Ctrl-B... and manually run the command autoboot.
In MS VirtualPC 2007 iPXE hangs at:

Code:

tftp://192.168.xxx.xxx/pxelinux.0… ok

In VMware Workstation 8 iPXE hangs at:

Code:

Trying to load: pxelinux.cfg/default
    Not enough memory to load specified image.
    boot:

iPXE boot normal without any problems from BIOS, other media or pressing Ctrl-B at second appearance statement. Maybe this is problem with INT13, INT18 or INT19 ?
First appearance: Press Ctrl-B to configure iPXE     <-- hangs up
Second appearance: Press Ctrl-B for the iPXE command line...     <-- working OK

Similar problem is with gPXE 1.0.1 inserted to BIOS AWARD 6.00PG. During pressing Ctrl-B at first appearance Press Ctrl-B... and autoboot command then vesamenu.c32 displays very slow :-(. If run gPXE normal or pressing Ctrl-B during second appearance Press Ctrl-B vesamenu.c32 working faster.