Kovid,
The problem is not converting them. The problem is adding them to the library. I usually drag and drop on my old Mac Pro. This problem just started this week. I am using version 8.51. If I drag and drop an EPUB it adds to the library fine and I can then convert it to mobi. However, if I drag and drop a MOBI file it just runs and runs and eventually gives me an error "adding book appears to have hung...".
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