Yes, several im afraid
Are you still on 1.1.3?
backup your own stuff, then uninstall lmms completely, including the config dot-file:
Read:
https://lmms.io/wiki/index.php?title=LM ... h_Settings
DL and install 1.2.0 RC5 with the orange buttons on dl-site:
https://github.com/LMMS/lmms/releases/d ... -win32.exe
I am not sure it will fix it, so please report back the result!