My wife’s reaction was, “what does this have to do with glowforge?”.
I am having a harder and harder time keeping her hopes up 
I impulse bought an old delta scroll saw 7-9 years ago for 40$. Was an old 80s model I think. It’s definitely not the best, but small so I can bring it out the once a year I need it. Definitely needs to be bolted down to keep it from running down the road. That’s how my belt sander escaped
My guess is that when you are attempting to cut on a curve you are not turning your work piece enough and are pushing sideways on the scroll saw blade. I still catch myself doing that, and I have been doing it a long time. 
I live in an apartment and I don’t have the space to have a big working area, so I’m thinking about a Rockwell BladeRunner X2 to cut bigger pieces than 1/4" (obviously smaller than 2" )then engrave them with the Glowforge 
I have the problem even on straight cuts. It seems I have to find the “sweet angle” to feed the work to follow a straight line. I probably just have a cheap-o saw.
Always remember you can use a cheapo scroll saw and it will do the job. There are different blades for different woods. #2 blade for 1/4" soft wood, #5 blade for 3/4" soft wood, #7 blades for 3/4"-1 1/2" hardwood, #9 blade for 1 1/2"-2 1/2" hardwood and #12 blade for straight cuts. I guess the most important aspect in using a scroll saw whether a cheapo or expensive saw is patience.
I really want to get into doing Intarsia art pieces. & of course just to fool around.
True. For me, there was a new lesson in patience with any cutting tool. When you get down to jeweler’s scale on coping saw blades, you develop a fine touch. 
What source do you use for blades?
I just purchased 7 doz on ebay 7 Dozen Flying Dutchman Scroll saw Blades Pinless Regular Reverse Intro Pack. I believe it was about $25.00 I have not received them yet. I’m currently using some blades I had from several years ago.
I have also used a jewelers saw for cutting detail work on coins.
A fine detail tool. In my mind the old school for laser-like cutting intricacy.
What’s the difference between a coping saw and a jeweler’s saw? Blade size?
Pretty much. Looks a little different and is generally adjustable in length but mostly it’s just the teeny tiny blades. You can google a picture.
I use one to do inlays for musical instruments.
Yes the Jeweler’s saw blade is much smaller. About the diameter of lead from a mechanical pencil.
I have blades that are not much larger than a hair. Need magnification to see which way the teeth point. 
That sounds like a Jeweler’s saw blade.
Found some real nice scroll saw patterns at this site http://www.sheilalandrydesigns.com/category/uncategorized-patterns
I remember when I first wanted to try coin cutting (into puzzle pieces). I ordered an inexpensive saw and some blades on Amazon. When I first opened the package, I thought the 144 blades (wrapped together with wire) were one blade until I realized how thin they were… 
Truly analog in a digital world…
Put a big grin on my face 
