First off, great plugin, use it on many of our sites.
My problem is related to searching for multiple tags. I have a search field , and checkboxes for my tags. I can search for a keyword with one tag selected and the results are perfect. However if I select 2 tags for the keyword the results only accept the last tag.
I believe it is something to do with how relevanssi makes the url as a normal search for multiple tags would be http://www.mysite.com/?s=keyword&tag=tag1,tag2 but relevanssi makes the url http://www.mysite.com/?s=keyword&tag=tag1&tag=tag2. When I manually insert the correct url, i get the correct results.
I have not been able to find where relevanssi builds the url from in the plugin files.
Any help appreciated.