CR2 question on Previews

[kevs]

When I have folder of CR2s, unfortunately every other image that comes up is a white page with text. Any way around this? It's so annoying.
Also strange if the .ivc file will not bubble up to the top even though I put a space in front of it.
I can convert to DNG to eliminate this annoyance, but strangely, with DNG, the previews are not crisp at 200% as the CR2S are, why is that? thanks.