Okay several points:
1 - It's generally bad form to resurrect a 2 year old thread. That's not a big deal in this case because you had a substantive question to add, but it's still a little confusing.
2 - In your first post you specifically stated "even in places where the alpha channel is pure white" but then in your second post said it only happens when there is no alpha info. If anyone had tried to help you it would have been an incredibly frustrating runaround because of that misinformation. Try to be careful not to tell us facts which aren't true.
3 - Actually as I recall what happens is that Blitz uses the image itself as the alpha channel. Imagine if you desaturated the image to make it greyscale and used that as the alpha channel. I don't recall exactly though so that may be incorrect.
4 - Rather than consider it a bug, you could simply not turn alpha transparency on when there is no alpha channel. Put another way, why are you turning on alpha transparency if you want the image to be fully solid?
1 - It's generally bad form to resurrect a 2 year old thread. That's not a big deal in this case because you had a substantive question to add, but it's still a little confusing.
2 - In your first post you specifically stated "even in places where the alpha channel is pure white" but then in your second post said it only happens when there is no alpha info. If anyone had tried to help you it would have been an incredibly frustrating runaround because of that misinformation. Try to be careful not to tell us facts which aren't true.
3 - Actually as I recall what happens is that Blitz uses the image itself as the alpha channel. Imagine if you desaturated the image to make it greyscale and used that as the alpha channel. I don't recall exactly though so that may be incorrect.
4 - Rather than consider it a bug, you could simply not turn alpha transparency on when there is no alpha channel. Put another way, why are you turning on alpha transparency if you want the image to be fully solid?