What happens when you have 2 wallets open at the same time? For example I have my original wallet open on one PC and I imported my private key to another PC (which is the same wallet). They are both open.. will that cause problems?
They both seem to be sync'd ok at the moment.
You can have as many wallets open as you want. You can even stake with all of them (if several wallets generate a block that use the same coins for staking, all but one block will get orphaned).