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--- root:troubleshooting [2013/06/14 12:11] – nchiap
+++ root:troubleshooting [2013/06/14 12:14] (current) – nchiap
@@ Line 3: / Line 3: @@
 Root-files can be the source of various problems.
 Usually they are caused by hidden changes in the internal state of ROOT.
-ROOT stores the active directory.
+ROOT stores the active directory and uses this to create new objects and look for existing ones.
-When a new histograms is created,  in the active directoy, existing histograms are looked for in
+The active directory is changed when a new file is opened.
+This can lead to unexpected behaviours and hard to trace bugs.
 ===== Empty Files =====
@@ Line 24: / Line 25: @@
 outputFile->Write();
 </code>

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