I really don't know... I've tried everything I could find online. The weirdest thing is that there doesn't seem to be a pattern to it. It does it with small blocks more often than with larger ones... but the insertion point, file size, etc... that's all random.
And I HATE IT! Grrr... I hope someone figures this out!
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I haven't come up with a better solution. It is random, and very frustrating.
I've stopped updating the .png files. At 1500 blocks, and the other "wants" the users have it's become a low priority.
Looking at your profile I see you have Acad 2012, I'd hoped that Autodesk had fixed it in a newer release but haven't bothered to open the box on '11 or '12.
"If you don't have time to do it right, will there be time to do it over?" this was hung on my boss' door 15 years ago for me to see on my first day... no pressure really!?!