To workspace block suddenly doesn't work anymore

Im running a Simulink simulation from an m-file. I have several "to workspace" blocks in there and I used to be able to display the output via plot(myvar).

But now I'm getting the error

"Undefined function or variable 'myvar'.

Error in mymfile (line 135) plot(myvar);"

Using simOut.get('myvar') works, but how can I get it to work as expected?

[Pawel Ladosz]

can you please show us screenshots of settings of 'to workspace' block? and then screenshot of matlab workspace