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If you get an error while posting, remove the http or www part of the link. It's a spam protection thing of the forum.

Can you right click anywhere on the page and click Inspect Element, then click on Console.
Does it show any javascript errors?
Do you have maybe some special plugins active that disable scripts or something like that?
What browser do you use? And does it also happen when you use a different browser?

In his new version of par2, there is the 'basepath' issue which SAB 1.2.1 detects and handles. But not 1.2.0.

In 1.2.1 these files can be handled now.
You can download the 1.2.1 beta here: https://sabnzbd.org/downloads

You can download the 1.2.1 beta now: https://sabnzbd.org/downloads

You can download the beta now: https://sabnzbd.org/downloads

Was +Debug on?
If so: can you send the logs again to [email protected]?

You can ignore the bad certificate warning in this case. You get a message because it's a self signed certificates, but since you know that you were the one to sign it, you can use it.
I imagine Dog to accept this, since this is Sab default behavior.

You select it in Config Switches, after placing it in your Scripts folder.

Yes

Have you enabled https?
It seems Dog is trying to establish a ssl connection, but Sab doesn't give it one.

Par2multicore will use all the cores it can get, it will use all. This also means that if you have for example 4 cores, there will be 4 cores reading from disk. Or when you have 8 cores (or threads) it will have 8 threads reading from disk. This is probably what is causing the strain on the disk. Yo...

Try indeed without Multicore!

Do you have 'Post-Process only verified jobs' turned OFF? It's ON by default.

Is fixed in the latest version on the develop branch (that's where you are on, right?), just download the latest version.