Image cropped when exporting to PNG

[kirko]

Hello,
I'm trying to export a 24x23px image (seen below magnified) into PNG file.
When I do that at Screen 72ppi, for some reason when it's all done it's cropped (as seen below in the example).

I tried exporting at High 300ppi (in which case nothing is cropped) and then resizing it in Corel Paint Shop, but in that case I have these "shadow effects" at 12 and 3 o'clock of the semicircle... the quality isn't great anyway.

Any idea why AI is cropping? I'm using CS4.

Thanks in advance.

[Albacore]

I don't know what is happening in CS4 as in CS3 it is OK! When your saving for the Web and Devices and you hit the Image Size tab and then you enter 24 into the largest size box everything works well. You can see from the attachment the the size is correct. As as usual AI files are too large to upload if you wan't my Illy file please PM me and I will send it to you.

[kirko]

Thanks!
I didn't even know that there's such a way to export. I'm still new to this.
Thanks again! You saved me a lot of head aches.