diff --git a/src/backend/metadata.cpp b/src/backend/metadata.cpp
index 41e9c3f4..8e79fe81 100644
--- a/src/backend/metadata.cpp
+++ b/src/backend/metadata.cpp
@@ -699,23 +699,33 @@ namespace boss {
         return false;
     }
 
-    std::map<string,bool> Plugin::CheckInstallValidity(const Game& game) const {
-        map<string,bool> issues;
+    std::vector<std::string> Plugin::CheckInstallValidity(const Game& game) const {
+        std::vector<std::string> errorMessages;
         if (tags.find(Tag("Filter")) == tags.end()) {
             for (vector<string>::const_iterator it=masters.begin(), endIt=masters.end(); it != endIt; ++it) {
-                if (!boost::filesystem::exists(game.DataPath() / *it) && !boost::filesystem::exists(game.DataPath() / (*it + ".ghost")))
-                    issues.insert(pair<string,bool>(*it,false));
+                if (!boost::filesystem::exists(game.DataPath() / *it) && !boost::filesystem::exists(game.DataPath() / (*it + ".ghost"))) {
+                    BOOST_LOG_TRIVIAL(error) << "\"" << name << "\" requires \"" << *it << "\", but it is missing.";
+                    errorMessages.push_back((boost::format(boost::locale::translate("This plugin requires \"%1%\" to be installed, but it is missing.")) % *it).str());
+                }
+                else if (!game.IsActive(*it)) {
+                    BOOST_LOG_TRIVIAL(error) << "\"" << name << "\" requires \"" << *it << "\", but it is inactive.";
+                    errorMessages.push_back((boost::format(boost::locale::translate("This plugin requires \"%1%\" to be active, but it is inactive.")) % *it).str());
+                }
             }
         }
         for (set<File>::const_iterator it=requirements.begin(), endIt=requirements.end(); it != endIt; ++it) {
-            if (!boost::filesystem::exists(game.DataPath() / it->Name()) && !(IsPlugin(it->Name()) && boost::filesystem::exists(game.DataPath() / (it->Name() + ".ghost"))))
-                issues.insert(pair<string,bool>(it->DisplayName(),false));
+            if (!boost::filesystem::exists(game.DataPath() / it->Name()) && !(IsPlugin(it->Name()) && boost::filesystem::exists(game.DataPath() / (it->Name() + ".ghost")))) {
+                BOOST_LOG_TRIVIAL(error) << "\"" << name << "\" requires \"" << it->Name() << "\", but it is missing.";
+                errorMessages.push_back((boost::format(boost::locale::translate("This plugin requires \"%1%\" to be installed, but it is missing.")) % it->Name()).str());
+            }
         }
         for (set<File>::const_iterator it=incompatibilities.begin(), endIt=incompatibilities.end(); it != endIt; ++it) {
-            if (boost::filesystem::exists(game.DataPath() / it->Name()) || (IsPlugin(it->Name()) && boost::filesystem::exists(game.DataPath() / (it->Name() + ".ghost"))))
-                issues.insert(pair<string,bool>(it->DisplayName(),true));
+            if (boost::filesystem::exists(game.DataPath() / it->Name()) || (IsPlugin(it->Name()) && boost::filesystem::exists(game.DataPath() / (it->Name() + ".ghost")))) {
+                BOOST_LOG_TRIVIAL(error) << "\"" << name << "\" is incompatible with \"" << it->Name() << "\", but both are present.";
+                errorMessages.push_back((boost::format(boost::locale::translate("This plugin is incompatible with \"%1%\", but both are present.")) % it->Name()).str());
+            }
         }
-        return issues;
+        return errorMessages;
     }
 
     bool Plugin::LoadsBSA(const Game& game) const {
diff --git a/src/backend/metadata.h b/src/backend/metadata.h
index 992476ea..0b968503 100644
--- a/src/backend/metadata.h
+++ b/src/backend/metadata.h
@@ -210,7 +210,7 @@ namespace boss {
         bool MustLoadAfter(const Plugin& plugin) const;  //Checks masters, reqs and loadAfter.
 
         //Validity checks.
-        std::map<std::string,bool> CheckInstallValidity(const Game& game) const;  //Checks that reqs and masters are all present, and that no incs are present. Returns a map of filenames and whether they are missing (if bool is true, then filename is a req or master, otherwise it's an inc).
+        std::vector<std::string> CheckInstallValidity(const Game& game) const;  //Checks that reqs and masters are all present, and that no incs are present. Returns a map of filenames and whether they are missing (if bool is true, then filename is a req or master, otherwise it's an inc).
     private:
         std::string name;
         bool enabled;  //Default to true.
diff --git a/src/gui/main.cpp b/src/gui/main.cpp
index 58091932..11f25b0c 100644
--- a/src/gui/main.cpp
+++ b/src/gui/main.cpp
@@ -738,16 +738,10 @@ void Launcher::OnSortPlugins(wxCommandEvent& event) {
 
             //Also check install validity.
             BOOST_LOG_TRIVIAL(trace) << "Checking that the current install is valid according to this plugin's data.";
-            map<string, bool> issues = graph[*vit].CheckInstallValidity(_game);
+            vector<string> issues = graph[*vit].CheckInstallValidity(_game);
             list<boss::Message> pluginMessages = graph[*vit].Messages();
-            for (map<string,bool>::const_iterator jt=issues.begin(), endJt=issues.end(); jt != endJt; ++jt) {
-                if (jt->second) {
-                    BOOST_LOG_TRIVIAL(error) << "\"" << jt->first << "\" is incompatible with \"" << graph[*vit].Name() << "\" and is present.";
-                    pluginMessages.push_back(boss::Message(boss::g_message_error, (format(loc::translate("\"%1%\" is incompatible with \"%2%\" and is present.")) % jt->first % graph[*vit].Name()).str()));
-                } else {
-                    BOOST_LOG_TRIVIAL(error) << "\"" << jt->first << "\" is required by \"" << graph[*vit].Name() << "\" but is missing.";
-                    pluginMessages.push_back(boss::Message(boss::g_message_error, (format(loc::translate("\"%1%\" is required by \"%2%\" but is missing.")) % jt->first % graph[*vit].Name()).str()));
-                }
+            for (vector<string>::const_iterator jt = issues.begin(), jtend = issues.end(); jt != jtend; ++jt) {
+                pluginMessages.push_back(boss::Message(boss::g_message_error, *jt));
             }
             if (!issues.empty())
                 graph[*vit].Messages(pluginMessages);