I'm guessing this is new behavior, as I have never run into a problem before, but double clicking a folder is always opening the folder in a new tab, which I have never wanted. Please let me know where the option is to disable this. Several searches within the settings did not turn up the right setting for me. Thanks.
Double-clicking where? Inside Opus or somewhere else?
Could be in File Types (under Settings menu) for the All folders type :
In the events tab what do you have under Left double click ?
Default should be Go but according to what you describe, you might have something like Go NEWTAB.
On my side, the standard opening folder in current tab has not changed for a long time.
In my case, clicking a folder name in the lister will open a new folder tab when the current folder tab is "Locked" (as shown with a lock in the folder tab name).
To unlock a folder tab, right click the folder tab, then click Lock Tab > Unlocked.
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Thank you. I had actually just figured it out, but you were exactly right as to the problem. I discovered the "lock - allow folder changes" setting.
As for double clicking where? As I said, double clicking a folder. Standard procedure for opening a folder, but I didn't yet understand the "lock a folder" feature... thanks, Grosner for the help on that. Nice troubleshooting.
I meant in which program. 
Folders double-clicked outside of Opus can be opened in Opus, etc.
Not important now you've worked it out, anyway.