I'm posting this for a friend of mine for whom I regularly offer Logos phone tech support.
On Logos 6.9 SR-1 Mac, he was having indexing issues so I had him "Rebuild Index". He went to bed with it at 44% and woke up at 44% (computer was set to never sleep). He then erased Logos and then redownloaded it and building the index froze up again at 44%. Any ideas?