Were you ever able to figure out the cause/solution of the tension issues? After taking it to the shop? Having the exact issue with my new-to-me PFAFF 1245 right now. It was running amazing and then I thread jammed it, threw the safety clutch (didn’t even know what it was at the time), retimed it according to the adjustment manual to best of my knowledge and the bobbin thread is looking exactly like yours. I tried tightening the top thread tension to see if that was the issue and it didn’t work. Tried loosening bobbin tension, nope. Ugh.
