diff --git a/plugins/sample/plugin.cpp b/plugins/sample/plugin.cpp
index e80beae..e597121 100644
--- a/plugins/sample/plugin.cpp
+++ b/plugins/sample/plugin.cpp
@@ -21,7 +21,7 @@ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 
 #include "plugin.h"
 
-#define CMD_SEP "-"
+#define CMD_SEP "-" 
 #define CMD_ABOUT "About..."
 // =============================================================================
 // Globals
@@ -60,12 +60,12 @@ typedef struct toolbar_button_info_s
 	IToolbarButton::EType type;
 } toolbar_button_info_t;
 
-static const toolbar_button_info_t toolbar_buttons[NUM_TOOLBAR_BUTTONS] =
+static const toolbar_button_info_t toolbar_buttons[NUM_TOOLBAR_BUTTONS] = 
 {
 	{
 		"sample.bmp",
 		"Sample",
-    	"Sample image",
+		"Sample image",
 		DoSample,
 		IToolbarButton::eToggleButton
 	},
@@ -146,7 +146,7 @@ CSynapseClientSample g_SynapseClient;
 #if __GNUC__ >= 4
 #pragma GCC visibility push(default)
 #endif
-extern "C" CSynapseClient* SYNAPSE_DLL_EXPORT Synapse_EnumerateInterfaces (const char *version, CSynapseServer *pServer)
+extern "C" CSynapseClient* SYNAPSE_DLL_EXPORT Synapse_EnumerateInterfaces (const char *version, CSynapseServer *pServer) 
 {
 #if __GNUC__ >= 4
 #pragma GCC visibility pop
@@ -161,7 +161,7 @@ extern "C" CSynapseClient* SYNAPSE_DLL_EXPORT Synapse_EnumerateInterfaces (const
 
 	g_SynapseClient.AddAPI(TOOLBAR_MAJOR, SAMPLE_MINOR, sizeof(_QERPlugToolbarTable));
 	g_SynapseClient.AddAPI(PLUGIN_MAJOR, SAMPLE_MINOR, sizeof(_QERPluginTable));
-
+	
 	g_SynapseClient.AddAPI(RADIANT_MAJOR, NULL, sizeof(g_FuncTable), SYN_REQUIRE, &g_FuncTable);
 	g_SynapseClient.AddAPI(QGL_MAJOR, NULL, sizeof(g_QglTable), SYN_REQUIRE, &g_QglTable);
 	g_SynapseClient.AddAPI(VFS_MAJOR, "*", sizeof(g_FileSystemTable), SYN_REQUIRE, &g_FileSystemTable);
@@ -177,7 +177,7 @@ bool CSynapseClientSample::RequestAPI (APIDescriptor_t *pAPI)
 {
 	if (!strcmp(pAPI->major_name, PLUGIN_MAJOR)) {
 		_QERPluginTable* pTable= static_cast<_QERPluginTable*>(pAPI->mpTable);
-
+	
 		pTable->m_pfnQERPlug_Init = QERPlug_Init;
 		pTable->m_pfnQERPlug_GetName = QERPlug_GetName;
 		pTable->m_pfnQERPlug_GetCommandList = QERPlug_GetCommandList;
@@ -185,12 +185,12 @@ bool CSynapseClientSample::RequestAPI (APIDescriptor_t *pAPI)
 		return true;
 	} else if (!strcmp(pAPI->major_name, TOOLBAR_MAJOR)) {
 		_QERPlugToolbarTable* pTable= static_cast<_QERPlugToolbarTable*>(pAPI->mpTable);
-
+	
 		pTable->m_pfnToolbarButtonCount = &ToolbarButtonCount;
 		pTable->m_pfnGetToolbarButton = &GetToolbarButton;
 		return true;
 	}
-
+	
 	Syn_Printf("ERROR: RequestAPI( '%s' ) not found in '%s'\n", pAPI->major_name, GetInfo());
 	return false;
 }
diff --git a/radiant/filters.cpp b/radiant/filters.cpp
index f4dd1ba..4931d4d 100644
--- a/radiant/filters.cpp
+++ b/radiant/filters.cpp
@@ -30,6 +30,10 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 #include "stdafx.h"
 
+// type 1 = texture filter (name)
+// type 3 = entity filter (name)
+// type 2 = QER_* shader flags
+// type 4 = entity classes
 bfilter_t *FilterAdd(bfilter_t *pFilter, int type, int bmask, char *str, int exclude)
 {
 	bfilter_t *pNew = new bfilter_t;
@@ -44,6 +48,21 @@ bfilter_t *FilterAdd(bfilter_t *pFilter, int type, int bmask, char *str, int exc
 	return pNew;
 }
 
+bfilter_t *FilterCreate (int type, int bmask, char *str, int exclude)
+{
+	g_qeglobals.d_savedinfo.filters = FilterAdd(g_qeglobals.d_savedinfo.filters, type, bmask, str, exclude);
+	Syn_Printf("Added filter %s (type: %i, bmask: %i, exclude: %i)\n", str, type, bmask, exclude);
+	return g_qeglobals.d_savedinfo.filters;
+}
+
+extern void PerformFiltering();
+
+void FiltersActivate (void)
+{
+	PerformFiltering();
+	Sys_UpdateWindows(W_XY|W_CAMERA);
+}
+
   // removes the filter list at *pFilter, returns NULL pointer
 bfilter_t *FilterListDelete(bfilter_t *pFilter)
 {
diff --git a/radiant/filters.h b/radiant/filters.h
index b09d36f..05776f5 100644
--- a/radiant/filters.h
+++ b/radiant/filters.h
@@ -22,6 +22,8 @@ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 #ifndef _FILTERS_H_
 #define _FILTERS_H_
 
+void FiltersActivate(void);
+bfilter_t *FilterCreate(int type, int bmask, char *str, int exclude);
 bfilter_t *FilterAdd(bfilter_t *pFilter, int type, int bmask, char *str, int exclude);
 bfilter_t *FilterListDelete(bfilter_t *pFilter);
 bfilter_t *FilterUpdate(bfilter_t *pFilter);
diff --git a/radiant/mainframe.cpp b/radiant/mainframe.cpp
index aa6ef5e..6c2bd2b 100644
--- a/radiant/mainframe.cpp
+++ b/radiant/mainframe.cpp
@@ -7474,10 +7474,14 @@ void PerformFiltering ()
 {
   brush_t *brush;
 
+  // mattn - this should be removed - otherwise the filters from the 
+  // plugins are wiped away with each update
+#if 1
   // spog - deletes old filters list and creates new one when
   // g_qeglobals.d_savedinfo.exclude is updated
   g_qeglobals.d_savedinfo.filters = FilterListDelete(g_qeglobals.d_savedinfo.filters);
   g_qeglobals.d_savedinfo.filters = FilterUpdate(g_qeglobals.d_savedinfo.filters);
+#endif
 
   for ( brush = active_brushes.next; brush != &active_brushes; brush = brush->next )
     brush->bFiltered = FilterBrush( brush );
diff --git a/radiant/pluginmanager.cpp b/radiant/pluginmanager.cpp
index 609e806..021531a 100644
--- a/radiant/pluginmanager.cpp
+++ b/radiant/pluginmanager.cpp
@@ -43,6 +43,7 @@ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 #include "pluginmanager.h"
 #include "plugin.h"
 #include "missing.h"
+#include "filters.h"
 
 #include "version.h"
 
@@ -2228,6 +2229,8 @@ bool CSynapseClientRadiant::RequestAPI(APIDescriptor_t *pAPI)
     pTable->m_pfnGetFileTypeRegistry = &GetFileTypeRegistry;
     pTable->m_pfnReadProjectKey = &QERApp_ReadProjectKey;
     pTable->m_pfnGetMapName = &QERApp_GetMapName;
+    pTable->m_pfnFilterAdd = &FilterCreate;
+    pTable->m_pfnFiltersActivate = &FiltersActivate;
 
     return true;
   }