I have mapped the file extensions ACV supports via intents to the appropriate mime types in Astro (my file manager). When I now launch a comic file, ACV opens it but as soon as it's opened, it immediately jumps to the last comic file I viewed. I don't know if this is an issue with Astro, but I got the impression that this may be the last viewed code in ACV overacting =)
It was indeed a bug introduced in version 1.3.10. Thank you for reporting it!
Since it's a bug that prevents the intent functionality to work properly, and most users haven't updated to version 1.3.10 yet, we just uploaded version 1.3.10.1 to the Android Market with the bug fix.