KLO, thanks for that info. Today I cleaned my machine (took out bobbin case) and NOW I definitely am having tension issues that I've never had before. Even pieced some scraps and my bobbin thread is coming to the top. I'm probably going to take my machine in tomorrow for a "look see". I've re-threaded the needle and bobbin multiple times, put in a new sharp needle, and even took the cover plate off several times to ensure I had put the bobbin case in correctly. Today, the top stitches look straight but the back stitches don't.