i will start with saying i love thread from connecting threads and use alot of it...but every now and then i start using one that will not be used...breaking- tension problems- all kinds of issues= i try everything else first---then i switch to a different cone (or spool) and the problems go away...
no idea why but our machines do seem to have (minds of their own) and sometimes they just will not use a certain thread.
i have found it more of a problem with different colors- (is that weird or what?)
as in a bought a whole collection of essential threads - use one it's wonderful...switch to a different color- breaking every 2"...frustraition- aggrivation---finally switch thread again- no more problems---
when i find the thread is a problem while quilting i can still use it without problem for piecing---
thread is as (personable) as our machines maybe...
anyhow= switch thread i bet your troubles go away...but don't give up on that thread- it may work just fine on the next project.