grub 0.90 prevents Standby in Windows

[A.Mueller]

Hello,
first I've got to accomplish you for having written the best 
bootmanager I know.
As already mentioned in the subject I recently had a problem installing 
Version 0.90 , coming with Linux Mandrake 8.1.

My system:
AMD Athlon 900 MHZ (Slot)
AMD Chipset
Riva TNT2 
384 mb RAM
Soundblaster PCI128
with Win98SE and Linux Mandrake (now Version 8.1)
Award-BIOS

After installing grub during the Linux-installation I booted Windows 
and recognized that the option to change to Standby-Mode was no longer 
present. In the control-center Win98 claimed a missing driver but 
trying to reinstall the driver it told me, the best driver was already 
installed. So I checked my BIOS but the settings were the same as the 
day before. My grub menu.lst was identically the same, as the one
I used before
As the only thing I've changed was the Installation of Mandrake 
and grub I cleared the mbr from a Win bootdisk and started the system.
After that the standby-option was present again and worked well.
I thought that something went wrong with the grub-installation and so I 
bootet my Linux from a bootdisk and reinstalled grub.
The same problem occured again. So I decided to fall back to Version
0.5.96.1  with wich I don't have the problem of the missing 
standby-mode in Windows 98.
To be sure that it is not a problem with this computer or with
my  Windows-installation, I installed Win on another
system without any vendor-drivers and after that installed Mandrake 8.1 
with grub. I got the same problem, that after that the standby-mode in 
Win98 was missing. This test-system is an Intel PIII, 850MHZ.
256MB RAM, ATI-graphics with Phoenix-BIOS.
So I asked in a Newsgroup (de.comp.gnu) whether someone else had the 
same problem and I got an answer from someone, using SuSE 7.2 with
grub 0.90 and Windows ME. He told me that the same problem occured on 
his computer. Only a fallback to grub-version 0.5.96.1 could bring back 
the standby-mode in Windows.
Do you already know about the problem and can you tell me, why it
occurs and wether there is a method to solve it or eventualley a patch?
I would be very glad to hear from you.

Thanks in advance and greetings from germany
Albert