I can confirm it as well (dualboot with Windows). However, I have temporary solution, too:
When you see the GRUB command line, type the following commands:
set root=(hdX,gptY)
set prefix=(hdX,gptY)/boot/grub
insmod normal
normal
You should see the normal GRUB screen now. Of course, replace X and Y in hdX,gptX with number of disk and partition you've installed elementary on, for instance sda5 = hd0,gpt5, sdb2 = hd1,gpt2, etc.
I can confirm it as well (dualboot with Windows). However, I have temporary solution, too:
When you see the GRUB command line, type the following commands:
set root=(hdX,gptY) (hdX,gptY) /boot/grub
set prefix=
insmod normal
normal
You should see the normal GRUB screen now. Of course, replace X and Y in hdX,gptX with number of disk and partition you've installed elementary on, for instance sda5 = hd0,gpt5, sdb2 = hd1,gpt2, etc.