Shawn, The "90" and "45" refer to the USB traffic rates you set for the ASI. Lower speed presumably helps with hanging problems, but did not solve it for me. The problem for me was also mostly with short F&F exposures of 1-9 seconds. However, it could also happen with longer ASI exposures, but not always and this is probably because there's a conflict when both cameras try to download at the same time and that happens much more frequently when both camera are taking short exposures. I also never had a problem with both cameras on the same hub when I shot with a DSLR, so this is most likely a ASI or USB driver issue.
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