Hi Alan
I am using
SparkSDR v2.0.33 I believe it is the most recent.
In regards to the zoom changing, I understand that modes like WSPR and FT8, etc do look better when zoomed in. Maybe you should change the zoom only when one of those modes are selected, but when USB, LSB, AM, FM are selected, you should keep the zoom untouched.
Thanks
Luis WA2163SWL