I have been trying to use the Debugger but if I enter a variable for modification as described in the online help:
https://www.visualmicro.com/page/User-Guide.aspx?doc=Working-With-Breakpoints-When-Hit.html
as  {counter=?}
the variable shown in the Expression window doesn't appear yellow and whilst I can modify its value in the window this new value is not used the program when it continues using  [F5] .

Okay so you are using the serial debugger. Did you press ENTER after changing the value? The new value might not display until the breakpoint is next hit but should be available to the code.

OK pressing ENTER after modifying the variable done the trick but the box is still not yellow, no big deal though.

Thanks for speedy response.
Jim

When we introduced themes the yellow didn't work to it was changed to just be different from readonly expressions. Which theme are using using?

I am using theme "Blue"
Jim

If you have more than one variable in the watch expressions is there a difference in color between readonly and modifiable variables?

read only appear in a cell with the same background colour as the window ie pale blue whereas the modifiable variables appear in a cell with a white background.

Jim

Yes the colors change depending on theme. Docs need updating.

Moved your next question to a new thread
https://www.visualmicro.com/forums/YaBB.pl?num=1566138738/0#0