Many others FMQ successfully ... fleece backing with pieced top.
Myself included .... including using spray baste.
You'll get many suggestions from others as to what may be causing your problems, but this is where I would start ............... My first suggestion would be for you to create a sample sandwich of regular cotton front and back as a check-test for FMQing. It may have worked fine before, but check that it is working OK right now. If it is not good, then make the changes to get it to work.
Once all is good, then switch to a trial sandwich with your fleece backing.
Same thing ... work with this until you are happy with your FMQ results.
If all is not good, then stick with your trial fleece sandwich and change something.
Just make one switch at a time, as if you make many changes,
you won't know what is working, or what is not.
Likewise, if you are making adjustments in the beginning on the cotton sandwich.
Good Luck!
Last edited by QuiltE; 01-11-2017 at 06:03 AM.