38cb735 created the issue

First, let me say that this is a super product! Before updating Cyberduck, I could have more than 1 download from the same server working simultaneously. Now, if I start 1 download and then start another before the 1st is finished, the 1st download aborts in the process. This is somewhat inconvenient when I am backing up files because it lengthens the time spent significantly. I used to be able to perform at least 3 downloads simultaneously, so I don't know if this is a bug or you made a change purposely.

Thank you for your hard work!