grub2 cannot boot windows (EFI) - Invalid Sector Size

I've been booting my Fedora 20 / Windows 7 Home Premium system using Grub2 for quite some time now. But after updating the system after ~9 months of no updates, I can no longer boot into Windows 7. Booting into Fedora is fine, but when I select Windows I get

Error: Invalid Sector Size 65535

Here is my /boot/efi/EFI/fedora/grub.cfg

#
# DO NOT EDIT THIS FILE
#
# It is automatically generated by grub2-mkconfig using templates
# from /etc/grub.d and settings from /etc/default/grub
#

### BEGIN /etc/grub.d/00_header ###
if [ -s $prefix/grubenv ]; then
  load_env
fi
if [ "${next_entry}" ] ; then
   set default="${next_entry}"
   set next_entry=
   save_env next_entry
   set boot_once=true
else
   set default="${saved_entry}"
fi

if [ x"${feature_menuentry_id}" = xy ]; then
  menuentry_id_option="--id"
else
  menuentry_id_option=""
fi

export menuentry_id_option

if [ "${prev_saved_entry}" ]; then
  set saved_entry="${prev_saved_entry}"
  save_env saved_entry
  set prev_saved_entry=
  save_env prev_saved_entry
  set boot_once=true
fi

function savedefault {
  if [ -z "${boot_once}" ]; then
    saved_entry="${chosen}"
    save_env saved_entry
  fi
}

function load_video {
  if [ x$feature_all_video_module = xy ]; then
    insmod all_video
  else
    insmod efi_gop
    insmod efi_uga
    insmod ieee1275_fb
    insmod vbe
    insmod vga
    insmod video_bochs
    insmod video_cirrus
  fi
}

terminal_output console
set timeout=5
### END /etc/grub.d/00_header ###

### BEGIN /etc/grub.d/10_linux ###
menuentry 'Fedora (3.17.7-200.fc20.x86_64) 20 (Heisenbug)' --class fedora --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-3.11.10-301.fc20.x86_64-advanced-630ea12e-0103-4fdd-80c9-c481ca82aebc' {
    load_video
    set gfxpayload=keep
    insmod gzio
    insmod part_gpt
    insmod ext2
    set root='hd0,gpt4'
    if [ x$feature_platform_search_hint = xy ]; then
      search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt4 --hint-efi=hd0,gpt4 --hint-baremetal=ahci0,gpt4  dedbc16b-8123-457a-b969-03927ebbd9d2
    else
      search --no-floppy --fs-uuid --set=root dedbc16b-8123-457a-b969-03927ebbd9d2
    fi
    linuxefi /vmlinuz-3.17.7-200.fc20.x86_64 root=UUID=630ea12e-0103-4fdd-80c9-c481ca82aebc ro vconsole.font=latarcyrheb-sun16  rhgb quiet LANG=en_AU.UTF-8
    initrdefi /initramfs-3.17.7-200.fc20.x86_64.img
}
menuentry 'Fedora (3.14.5-200.fc20.x86_64) 20 (Heisenbug)' --class fedora --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-3.11.10-301.fc20.x86_64-advanced-630ea12e-0103-4fdd-80c9-c481ca82aebc' {
    load_video
    set gfxpayload=keep
    insmod gzio
    insmod part_gpt
    insmod ext2
    set root='hd0,gpt4'
    if [ x$feature_platform_search_hint = xy ]; then
      search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt4 --hint-efi=hd0,gpt4 --hint-baremetal=ahci0,gpt4  dedbc16b-8123-457a-b969-03927ebbd9d2
    else
      search --no-floppy --fs-uuid --set=root dedbc16b-8123-457a-b969-03927ebbd9d2
    fi
    linuxefi /vmlinuz-3.14.5-200.fc20.x86_64 root=UUID=630ea12e-0103-4fdd-80c9-c481ca82aebc ro vconsole.font=latarcyrheb-sun16  rhgb quiet LANG=en_AU.UTF-8
    initrdefi /initramfs-3.14.5-200.fc20.x86_64.img
}
menuentry 'Fedora (3.14.4-200.fc20.x86_64) 20 (Heisenbug)' --class fedora --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-3.11.10-301.fc20.x86_64-advanced-630ea12e-0103-4fdd-80c9-c481ca82aebc' {
    load_video
    set gfxpayload=keep
    insmod gzio
    insmod part_gpt
    insmod ext2
    set root='hd0,gpt4'
    if [ x$feature_platform_search_hint = xy ]; then
      search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt4 --hint-efi=hd0,gpt4 --hint-baremetal=ahci0,gpt4  dedbc16b-8123-457a-b969-03927ebbd9d2
    else
      search --no-floppy --fs-uuid --set=root dedbc16b-8123-457a-b969-03927ebbd9d2
    fi
    linuxefi /vmlinuz-3.14.4-200.fc20.x86_64 root=UUID=630ea12e-0103-4fdd-80c9-c481ca82aebc ro vconsole.font=latarcyrheb-sun16  rhgb quiet LANG=en_AU.UTF-8
    initrdefi /initramfs-3.14.4-200.fc20.x86_64.img
}
menuentry 'Fedora, with Linux 0-rescue-cc5a949f27284f5196ba1d294898e73b' --class fedora --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-0-rescue-cc5a949f27284f5196ba1d294898e73b-advanced-630ea12e-0103-4fdd-80c9-c481ca82aebc' {
    load_video
    insmod gzio
    insmod part_gpt
    insmod ext2
    set root='hd0,gpt4'
    if [ x$feature_platform_search_hint = xy ]; then
      search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt4 --hint-efi=hd0,gpt4 --hint-baremetal=ahci0,gpt4  dedbc16b-8123-457a-b969-03927ebbd9d2
    else
      search --no-floppy --fs-uuid --set=root dedbc16b-8123-457a-b969-03927ebbd9d2
    fi
    linuxefi /vmlinuz-0-rescue-cc5a949f27284f5196ba1d294898e73b root=UUID=630ea12e-0103-4fdd-80c9-c481ca82aebc ro vconsole.font=latarcyrheb-sun16  rhgb quiet
    initrdefi /initramfs-0-rescue-cc5a949f27284f5196ba1d294898e73b.img
}

### END /etc/grub.d/10_linux ###

### BEGIN /etc/grub.d/15_Windows ###
menuentry "Windows" {
        insmod part_gpt
        insmod fat
        insmod search_fs_uuid
        insmod chain
        chainloader (hd0,1)/EFI/Microsoft/bootmgfw.efi
}
### END /etc/grub.d/15_Windows ###

### BEGIN /etc/grub.d/20_linux_xen ###

### END /etc/grub.d/20_linux_xen ###

### BEGIN /etc/grub.d/20_ppc_terminfo ###
### END /etc/grub.d/20_ppc_terminfo ###

### BEGIN /etc/grub.d/30_os-prober ###
### END /etc/grub.d/30_os-prober ###

### BEGIN /etc/grub.d/40_custom ###
# This file provides an easy way to add custom menu entries.  Simply type the
# menu entries you want to add after this comment.  Be careful not to change
# the 'exec tail' line above.
### END /etc/grub.d/40_custom ###

### BEGIN /etc/grub.d/41_custom ###
if [ -f  ${config_directory}/custom.cfg ]; then
  source ${config_directory}/custom.cfg
elif [ -z "${config_directory}" -a -f  $prefix/custom.cfg ]; then
  source $prefix/custom.cfg;
fi
### END /etc/grub.d/41_custom ###

Partition table of /dev/sda

[root@ws1 gruss]# gdisk 
GPT fdisk (gdisk) version 0.8.10

Type device filename, or press  to exit: /dev/sda
Partition table scan:
  MBR: protective
  BSD: not present
  APM: not present
  GPT: present

Found valid GPT with protective MBR; using GPT.

Command (? for help): p
Disk /dev/sda: 468862128 sectors, 223.6 GiB
Logical sector size: 512 bytes
Disk identifier (GUID): BA0D0192-935E-4735-A15F-9846A182C1AE
Partition table holds up to 128 entries
First usable sector is 34, last usable sector is 468862094
Partitions will be aligned on 2048-sector boundaries
Total free space is 3181 sectors (1.6 MiB)

Number  Start (sector)    End (sector)  Size       Code  Name
   1            2048          206847   100.0 MiB   EF00  EFI System Partition
   2          206848          468991   128.0 MiB   0C01  Microsoft reserved ...
   3          468992       204802047   97.4 GiB    0700  Basic data partition
   4       204802048       205826047   500.0 MiB   0700  
   5       205826048       222111743   7.8 GiB     8200  
   6       222111744       326969343   50.0 GiB    0700  
   7       326969344       468860927   67.7 GiB    0700  

Command (? for help):