There is a >new release< that fixes a critical bug that has been causing extraneous LF’s (line feeds) in the pattern & measurment files, and in certain use cases the loss of all the data in a measurement file. It is highly advised everyone update to the lastest release.
You can update through the Help > About > Check for Updates button in Seamly2D or directly from the Github link.
If your measurement file has a lot of empty lines in it, it may take a while for SeamlyMe to open it.
If you want to fix it, you can remove all the empty lines opening your measurement file with Notepad++ (it may take a while to load it) and clicking on Edit > Line Operations > Remove Empty Lines
Seamly should be updated soon to automatically remove those empty lines though.
