[Uleat]

This is untested, but shouldn't cause any issues:

[putitemtrace.patch - built on rev 2284]

Index: common/Item.cpp
===================================================================
--- common/Item.cpp	(revision 2284)
+++ common/Item.cpp	(working copy)
@@ -660,11 +660,15 @@
 	if (!inst) {
 		// User is effectively deleting the item
 		// in the slot, why hold a null ptr in map<>?
+		LogFile->write(EQEMuLog::Error, "(Inventory::PutItem::slot_id = %i, ItemInst = NULL", slot_id);
 		return slot_id;
 	}
 	
 	// Delegate to internal method
-	return _PutItem(slot_id, inst.Clone());
+	LogFile->write(EQEMuLog::Error, "Inventory::PutItem::slot_id = %i, ItemInst = !NULL", slot_id);
+	sint16 putitem_return = _PutItem(slot_id, inst.Clone());
+	LogFile->write(EQEMuLog::Error, "Inventory::PutItem::putitem_return = %i", putitem_return);
+	return putitem_return;
 }
 
 // Swap items in inventory
@@ -1182,6 +1186,7 @@
 	if (inst == NULL) {
 		//Why do we not delete the poped item here????
 		PopItem(slot_id);
+		LogFile->write(EQEMuLog::Error, "Inventory::_PutItem::slot_id = %i, ItemInst = NULL", slot_id);
 		return slot_id;
 	}
 	
@@ -1226,7 +1231,7 @@
 		LogFile->write(EQEMuLog::Error, "Inventory::_PutItem: Invalid slot_id specified (%i)", slot_id);
 		safe_delete(inst); // Slot not found, clean up
 	}
-	
+	LogFile->write(EQEMuLog::Error, "Inventory::_PutItem::slot_id = %i, result_return = %i, ItemInst = !NULL", slot_id, result);
 	return result;
 }
 
Index: common/shareddb.cpp
===================================================================
--- common/shareddb.cpp	(revision 2284)
+++ common/shareddb.cpp	(working copy)
@@ -703,6 +703,7 @@
 				LogFile->write(EQEMuLog::Error,
 					"Warning: Invalid slot_id for item in inventory: name=%s, acctid=%i, item_id=%i, slot_id=%i",
 					name, account_id, item_id, slot_id);
+				LogFile->write(EQEMuLog::Error, "(SharedDatabase::GetInventory::put_slot_id = %i)", put_slot_id);
 			}
 		}
 		mysql_free_result(result);

Try this, and the next time the issue comes up, post the log again.