Xviewer 1.35 will not recall MATH Channels:

 

After opening a WVF file and performing MATH functions in Xviewer Math version 1.35 - adjusting display settings, scale settings, etc - and then saving the setting information to a .XML file, the next time the WVF file is opened, the MATH channels do not appear. (MATH settings, formulas, constants are preserved).

 

Solution:

Please upgrade your Xviewer Math installation to the latest version.