Alpha icons support

Hi,

I've got a bit of a problem with Alpha icon support. I am trying to get alpha blending working in my application, in a toolbar and a shortcutbar.

 Initially, I was using Toolkit Pro 8.6, and had the following situation:
 

• alpha icons load fine under Windows XP
• alpha icons are not displayed under Windows 2000/NT, and the application falls back to my default  non-alphablended toolbars/shortcut bar (XTPImageManager()->IsAlphaIconsSupported() returns FALSE)
  

To try to make the program display correctly on 2000/NT, I upgraded to Toolkit Pro 8.7.  However, now I have the following behaviour:

• alpha icons are not displayed under Windows XP, and the application falls back to my default  non-alphablended toolbars/shortcut bar (even though XTPImageManager()->IsAlphaIconsSupported() returns TRUE!)
• Under 2000/NT, toolbar icons fall back to their non-alphablended defaults, and shortcutbar icons disappear entirely (just empty space!)
  

Clearly it's not a fault with my code only, since it happens with the demo programs, such as ShortCutBar and GUI_WinZip. (Even the pre-compiled demos downloaded from this site are the same, so it's not an error in my compile environment, either.)  As per the recommendation in another post, I have tried both 16- and 24-bit graphics, which made no difference.

So, how can I make this work? And why do  the ShortCutBar and GUI_WinZip demos I downloaded not display correctly on any of the Win2K boxes here?

Thanks,

Dean