Wrong .less compitalation

I have less style declared in following way:

.border-radius(@values: "0px") {
    border-radius: e(@values);
    -moz-border-radius: e(@values);
    -webkit-border-radius: e(@values);
}

and then I have declaration:

.mystyle{ 
    .border-radius(0px 0px 5px 5px);
}

In browser, when I'm using less extension everything is correct:

.mystyle{
  border-radius: 0px 0px 5px 5px;
  -moz-border-radius: 0px 0px 5px 5px;
  -webkit-border-radius: 0px 0px 5px 5px;
}

however style compiled by Workbench looks like:

.mystyle{
  border-radius: [object Object],[object Object],[object Object],[object Object];
  -moz-border-radius: [object Object],[object Object],[object Object],[object Object];
  -webkit-border-radius: [object Object],[object Object],[object Object],[object Object];
}

Which causing compilation totally unasable for me.

We roughly track along with the official releases and we use the JavaScript files which are made available within Web Workbench for the compilation. If you have a look at http://less2css.org/ you will see the same output being generated so if this used to work but doesn't now I suspect this will have changed in a recent update with Less. It looks though that this is caused by your use of the escape function around the values.

e.g. this generates the output you are expecting.

.border-radius(@values: "0px") {
    border-radius: @values;
    -moz-border-radius: @values;
    -webkit-border-radius: @values; 
}

.mystyle{ 
    .border-radius(0px 0px 5px 5px);
}

Jeremy