diff --git a/Rlabkey/DESCRIPTION b/Rlabkey/DESCRIPTION
index 62beef7..fe58ab1 100755
--- a/Rlabkey/DESCRIPTION
+++ b/Rlabkey/DESCRIPTION
@@ -1,6 +1,6 @@
 Package: Rlabkey
-Version: 3.4.5
-Date: 2026-01-20
+Version: 3.4.6
+Date: 2026-02-17
 Title: Data Exchange Between R and 'LabKey' Server
 Authors@R: c(person(given = "Peter",
                     family = "Hussey",
diff --git a/Rlabkey/NEWS b/Rlabkey/NEWS
index 7c08239..c804471 100644
--- a/Rlabkey/NEWS
+++ b/Rlabkey/NEWS
@@ -1,3 +1,7 @@
+Changes in 3.4.6
+  o Incorporate new filter types for Array (Multi-value text choice) fields
+  o Update listToMatrix to handle cases where the list elements are an array of strings, which will return a comma separated string in the response
+
 Changes in 3.4.5
   o Switch to using path first URLs for LabKey server requests.
   o Utilize httr to generate request query parameters.
diff --git a/Rlabkey/R/makeFilter.R b/Rlabkey/R/makeFilter.R
index b815936..758b486 100755
--- a/Rlabkey/R/makeFilter.R
+++ b/Rlabkey/R/makeFilter.R
@@ -32,6 +32,13 @@ makeFilter <- function(..., asList=FALSE)
             # These operators require a data value
             #
 
+            # Array-valued column operators
+            "ARRAY_CONTAINS_ALL"="arraycontainsall",
+            "ARRAY_CONTAINS_ANY"="arraycontainsany",
+            "ARRAY_CONTAINS_EXACT"="arraymatches",
+            "ARRAY_CONTAINS_NOT_EXACT"="arraynotmatches",
+            "ARRAY_CONTAINS_NONE"="arraycontainsnone",
+
             "EQUALS"="eq",
             "EQUAL"="eq",
             "DATE_EQUAL"="dateeq",
@@ -90,6 +97,9 @@ makeFilter <- function(..., asList=FALSE)
             # These are the "no data value" operators
             #
 
+            "ARRAY_ISEMPTY"="arrayisempty",
+            "ARRAY_ISNOTEMPTY"="arrayisnotempty",
+
             "ISBLANK"="isblank",
             "IS_MISSING"="isblank",
             "MISSING"="isblank",
diff --git a/Rlabkey/man/Rlabkey-package.Rd b/Rlabkey/man/Rlabkey-package.Rd
index 475fc05..8355fa8 100755
--- a/Rlabkey/man/Rlabkey-package.Rd
+++ b/Rlabkey/man/Rlabkey-package.Rd
@@ -18,8 +18,8 @@ schema objects (\code{labkey.getSchema}).
 \tabular{ll}{
 Package: \tab Rlabkey\cr
 Type: \tab Package\cr
-Version: \tab 3.4.5\cr
-Date: \tab 2026-01-20\cr
+Version: \tab 3.4.6\cr
+Date: \tab 2026-02-17\cr
 License: \tab Apache License 2.0\cr
 LazyLoad: \tab yes\cr
 }
diff --git a/Rlabkey/man/makeFilter.Rd b/Rlabkey/man/makeFilter.Rd
index 28bc877..f14a171 100755
--- a/Rlabkey/man/makeFilter.Rd
+++ b/Rlabkey/man/makeFilter.Rd
@@ -23,6 +23,13 @@ the column name, operator and value.
 }
 
 Operator values:\cr
+ARRAY_CONTAINS_ALL\cr
+ARRAY_CONTAINS_ANY\cr
+ARRAY_CONTAINS_EXACT\cr
+ARRAY_CONTAINS_NOT_EXACT\cr
+ARRAY_CONTAINS_NONE\cr
+ARRAY_ISEMPTY\cr
+ARRAY_ISNOTEMPTY\cr
 EQUAL\cr
 DATE_EQUAL\cr
 NOT_EQUAL\cr
@@ -58,7 +65,7 @@ EXP_CHILD_OF\cr
 EXP_PARENT_OF\cr
 EXP_LINEAGE_OF\cr
 
-When using the MISSING, NOT_MISSING, MV_INDICATOR, or NO_MV_INDICATOR operators, an empty string should be supplied as the value.
+When using the MISSING, NOT_MISSING, MV_INDICATOR, NO_MV_INDICATOR, ARRAY_ISEMPTY, or ARRAY_ISNOTEMPTY operators, an empty string should be supplied as the value.
 See example below.
 }
 
diff --git a/Rlabkey/src/listToMatrix.cpp b/Rlabkey/src/listToMatrix.cpp
index 52c3d46..3df35e9 100644
--- a/Rlabkey/src/listToMatrix.cpp
+++ b/Rlabkey/src/listToMatrix.cpp
@@ -1,4 +1,5 @@
 #include <Rcpp.h>
+#include <string>
 using namespace Rcpp;
 
 // [[Rcpp::export]]
@@ -35,11 +36,30 @@ CharacterMatrix listToMatrix(List data, List names) {
         }
         else
         {
-          // only try to parse the first vector element as a string if it is non-null
+          // only try to parse the vector elements if the first element is not null
           GenericVector gv = as<GenericVector>((as<List>(data[i]))[as<int>(indexList[j])]);
           if(gv.size() > 0 && !Rf_isNull(gv[0]))
           {
-            cMatrix(i,j) = as<CharacterVector>(gv[0])[0];
+            // Check if first element is a string - if so, concatenate all elements
+            if(TYPEOF(gv[0]) == STRSXP)
+            {
+              std::string result;
+              for(int k = 0; k < gv.size(); k++)
+              {
+                if(!Rf_isNull(gv[k]) && TYPEOF(gv[k]) == STRSXP)
+                {
+                  String s = as<String>(gv[k]);
+                  if(k > 0) result += ",";
+                  result += s.get_cstring();
+                }
+              }
+              cMatrix(i,j) = result;
+            }
+            else
+            {
+              // Fallback to just returning the first element
+              cMatrix(i,j) = as<CharacterVector>(gv[0])[0];
+            }
           }
         }
       }