Have rethreaded, redid bobbin , have moved reverse button up and down several times, seems like it is locked in reverse.
The reverse button may have loosened check for looseness and tighten if possible
SOURCE: Why would my Singer 6235 not feed the fabic:
h! there,
fabric moves forward when machine run due to movement of feed dogs,feed dog has a teeth, when your foot presser goes down attached to fabrics the pressure hold the fabric between pressure foot and feed dogs that why when machine run feed dogs pushed fabric when recieved stitch.try to check adjustment of feed dogs it maybe set at rest or neutral.reset it to upward towards needle.check also bobbins thread if accumulation was build up under feed dogs.regard and have a nice day.
SOURCE: The bobbin case on my Singer Inspiration 4210
From what I gather on other sites, your thread has to be threaded under tension.... You have to make sure you hear a click when your bringing your thread down to the bottom of the "arm". Also, I thought the bobbin case was rather loosely held in its place, I adjusted this by unscrewing the black plate and moving it over just a smidge. The bobbin is supposed to have some wiggle room, but it kept popping up and making the tiny adjustment seems to have done the trick....for now...
SOURCE: how do i replace the bobbin case in singer machine
When you insert the bobbin case, make sure the "knub" on the bobbin case (#1) is just to the left of the position finger bracket (#2). It should sit in there nicely and you should be able to spin the hand wheel freely. 
Let me know if you need more help,
Chris
SOURCE: Bobbin won't spin to allow needle to catch thread
sometimes when you break a needle it can cause the machine to
jump time, the machine would have to be taken to a sewing machine
shop to be checked by the technican
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