I just got my first GUN Wallet 1.3 (desktop) a few weeks ago. All this crypto stuff is new to me. I upgraded to GUN 1.4 on my desktop with no problem. I copied my .guncoin to my laptop and installed another GUN Wallet 1.4 there with no problems. So... will having two GUN Wallets potentially running at the same time like this cause any problems?
If you copied over the wallet.dat file, it could potentially be a problem
if, and only if you are solo mining. (some blocks mined to one wallet might not show up in the other)
Other than that, no, it won't cause an issue having the same wallet.dat on multi machines. As they sync to the blockchain, any changes on one will be synced with the other as soon as it syncs to the block chain.
If you just installed them separately, no worries, they are separate and won't interfere with each other at all.