apachesolr filters do not work I have installed apachesolr module and built the index for it. now i can search normally but when i filter the result using any enabled filter, the result DOES'T change and i get the same result of searching for the key. for example i searched for business and then filtered the result using taxonomy tid:36 and i got the same result before filtering!!
I have var_dump the $query that has been generated at line 215 in apachesolr_search.module and part of the result is shown below


object(Solr_Base_Query)#17 (13) {
  ["id"]=>
  int(1)
  ["fields":protected]=>
  array(0) {
  }
  ["fields_added":protected]=>
  array(0) {
  }
  ["fields_removed":protected]=>
  array(0) {
  }
  ["filterstring":protected]=>
  string(6) "tid:36"
  ["field_map":protected]=>
  array(0) {
  }
  ["subqueries":protected]=>
  array(0) {
  }
  ["keys":protected]=>
  string(8) "business"
  ["base_path":protected]=>
  string(24) "search/apachesolr_search"
  ["solr":protected]=>
  object(Drupal_Apache_Solr_Service)#16 (20) {....


also the filter doesn't appear in CURRENT SEARCH block. the block still showing


CURRENT SEARCH
Search found 38 items

(-) business


Also I have made a var_dump for params array that has been generated in function apachesolr_search_execute in apachesolr_search.module at line 212 and the result was:


array(13) {
  ["fl"]=>
  string(71) "id,nid,title,comment_count,type,created,changed,score,path,url,uid,name"
  ["rows"]=>
  int(10)
  ["facet"]=>
  string(4) "true"
  ["facet.mincount"]=>
  int(1)
  ["facet.sort"]=>
  string(4) "true"
  ["hl"]=>
  NULL
  ["hl.fragsize"]=>
  NULL
  ["hl.simple.pre"]=>
  NULL
  ["hl.simple.post"]=>
  NULL
  ["hl.snippets"]=>
  NULL
  ["hl.fl"]=>
  NULL
  ["spellcheck.q"]=>
  string(8) "business"
  ["spellcheck"]=>
  string(4) "true"
}


nothing for fq=tid:36
any idea of what i might be missing? or how to fix it?
Thanks for your help
You should consider using Search API module, which can handle Solr and facets, and enables you to use Views to create the search page and has a very good UI for creating search index with facets ect.

I've used it several times and have been pleased with the result.