There seems to be an issue with the filter / parameters with comma separated values for Multivalue. I've tried numerous ways to get this to work directly in the preview function on the report designer. Nothing done so far works.
Set Filter to multi
Set Parameter to IN 
Typed in value, value - typed in 'value','value', etc. This is a basic text field so I am not certain as to what exactly should be put in the filter box to allow for 2 or more values in a filter.
This produces data on the report with IN and Multivalue 
This produces an error
The current data set presented in the report did not produce any significant content, so no pages were generated. If you need to see the whole report content, including blank pages, please contact the report author.
Please advise exactly how to do this with an example. I have scoured the forums and the documentation with no relevant information that works for a multiple value field.
Thanks in advance.
Allison