Xengine option AppDomainLoading default option true is causing problems with several mono versions. Until a fix is found change the default to false, so this is not a major problem for the less technical skilled users.

bin/OpenSim.ini.example

@@ -903,8 +903,10 @@
     ;;
     ;; However, setting this to false will also prevent script DLLs from being unloaded from memory if the script is deleted.
     ;; This may cause an OutOfMemory problem over time when avatars with scripted attachments move in and out of the region.
-    ;; Some Windows users have also reported script loading problems when AppDomainLoading = false
-    ; AppDomainLoading = true
+    ;; at this time some mono versions seem to have problems with the true option
+    ;; so default is now false until a fix is found, to simply life of less technical skilled users.
+    ;; this should only be a issue if regions stay alive for a long time with lots of scripts added or edited.
+    ; AppDomainLoading = false
 
     ;; Controls whether scripts are stopped by aborting their threads externally (abort) or by co-operative checks from the compiled script (co-op) 
     ;; co-op will be more stable but this option is currently experimental.

bin/OpenSimDefaults.ini

@@ -1690,12 +1690,13 @@
     ; Stack size per thread created
     ThreadStackSize = 262144
 
-    ; Set this to true (the default) to load each script into a separate
+    ; Set this to true to load each script into a separate
     ; AppDomain. Setting this to false will load all script assemblies into the
-    ; current AppDomain, which will reduce the per-script overhead at the
-    ; expense of reduced security and the inability to garbage collect the
-    ; script assemblies
-    AppDomainLoading = true
+    ; current AppDomain, which will reduce the per-script overhead but deleted scripts stay inactive using memory
+    ; this may only be a problem if regions stay alive for a long time with lots of scripts added or edited.
+    ; at this time some mono versions seem to have problems with the true option
+    ; so default is now false until a fix is found
+    AppDomainLoading = false
 
     ; Controls whether previously compiled scripts DLLs are deleted on sim restart. If you set this to false
     ; then startup will be considerably faster since scripts won't need to be recompiled. However, then it becomes your responsibility to delete the