This worked in 7.2, it breaks in 7.3. It only happens if the pro variable grid field has early parsing toggled ‘on’. If I turn it off, it works.
My template looks like:
{exp:pro_variables:parse var="lv_gridtest"}
the file: {lv_gridtest:g_file}<br/>
the text: {lv_gridtest:g_text}<br/>
{/exp:pro_variables:parse}
This outputs:

My grid field had 2 rows:
