Get this when starting any of the latest builds on a mac [ 0.9.3 works fine ]. I click OK and app quits straight away.

Invalid amount for -paytxfee=<amount>:'0.00' (must be at least 0.00001000BTC/kB)

Anybody any ideas on how to fix ?

Thanks !!

edit : never mind - edited the bitcoin.conf to reflect the correct amount

This is very helpful - thank you. I shall take a swing at the Bitcoin.conf file

Multibit requires Java and Electrum is slightly above my pay grade to install 

Running latest Bitcoin QT on a MBA that has been crashing a lot of late I need to reindex blocks it seems every week. Takes days and max's out my processor so its very troublesome. Anyway to relocate files to an external drive or run the block indexing process on a remote server [ Linux / Softalicious ] ? Apologizes if I am missing some key issues in this query. Don't want to run anything with Java or host with an online wallet [ remember Bitcoinica ? ]. Suggestions ?

Thanks very much

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aha !  both replies really help.... thank you so much....

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This may sound like rather a dumb question but should one's bitcoin wallet and blockchain show the same balance ? Mine don't and I feel like I am missing something here.

Thanks !