I know this is operator error, as I have searched and experimented for a solution. I’m currently using paper trading to get a feel for TWS and I’ve lost my confidence to use my real account due to non-base currency balance issues. In paper trading I have ‘insufficient funds’ problems allowing me to buy but not sell FX AUDUSD, requiring an exit by reducing the initial purchase by a few dollars. I also have a $ 0.37 USD balance in my AUD base currency trading account that I have been informed may be cleared automatically at some time; this was due to long held FX position I lost on due to the admin of life distracting me. My question for the knowledgeable and experienced is if I scalp/swing trade US stocks and futures from my AUD base currency account, could I find myself accumulating USD which may stop me getting in or out of a trade similar to the FX situation in my paper account. I have tried the 'Close All Non-Base Currency Positions’, but it leaves a small amount that locks up the ability to trade. Part of the problem seems to be conversion from USD fees to AUD which has cents instead of whole dollars. I’m happy to accept that ‘I’m stupid’ comments just so I can solve this. Thanks.