This is for Build 6884 Smath Studio Desktop under Mono on Linux Mint 19. Very bad problems:

1) Can not save Pages with filetype sm. When the Page is opened, instead of 1 page the bottom indicator says page 1 of 42000 and the program hangs for a while and then is very slow. Files can be saved under Mathcad filetype but save and recovery unreliable.

2) Program can't find files under importData("path") or rfile(filename). Program says "file does not exist". Using rfile() you get "empty stack". Also path rules in importDate very restrictive -- designed for Windows, i.e. C:/ --- does not recognize \ path delimiter, seems to want letter designation for disk --- can't seem to recognize linux file system.

Running 6884 on Ubuntu 18.04. SMath will not even open with latest mono-complete 5.18.0.240 from xamarin website.

I just disabled Wayland in Ubuntu 18.04 and installed xfce4 desktop. SMath opens and seems to be working now.