Jagged icons when upgraded to 5.1 from 5.0

Hi.
I have problem with TLB v5.1.
Since upgrade from 5.0, my icons in TLB taskbar are suddenly jagged. I'm attaching the screenshot .
I tried changing sizes but that didn't help. I really would like to avoid reinstalling TLB.
Any suggestions?

What is your windows version? What is the icon size on your toolbar? Also please can you send me one of the icons if this is possible?

Sorry for not telling more in the first place.
As I can see, the only problem is with PNG icons, not with .ico files (they render good).
Icon size is standard Large size (32x32).
My system is Windows 7 Ultimate x64, all updates included. Graphics card is 9800Gt, the latest Nvidia drivers applied.

Here is one PNG icon example:

Now I see, thank you. I'll try to improve the resizing quality in the next version.

I guess the better way to make icons better - resizing them in some external software like Paint.Net
You'll get the better icons and reduce the TLB loading time.

can I till next version downgrade to 5.0 without loosing any settings and custom menu's?

can I till next version downgrade to 5.0 without loosing any settings and custom menu's?

Yes, the simple way:
1) Close TLB and restart computer.
2) Delete file C:\Program Files\TrueLaunchBar\tlb.dll
3) Install version 5.0

You have to close TLB and restart computer to unlock the tlb.dll, otherwise you can't to delete this dll.

thanx!