Hello Stefan,

tree_struct.n_tree keeps counting up from run to run (in book_ttree). This should 
presumably not be the case, since CloseRootOutputFile() frees the trees at eor().

------------------- output ---------------------------
lamb@lamb2:~/midas/root_3705> ./analyzer -e 
exa_root -i /tmp/midas/examples/root/run%05d.mid -o /tmp/midas/run%05d.root -r 1 2
Root server listening on port 9090...
Running analyzer offline. Stop with "!"
book_ttree: tree_struct.n_tree = 1
book_ttree: tree_struct.n_tree = 2
Set run number 1 in ODB
Load ODB from run 1...OK
/tmp/midas/examples/root/run00001.mid:2722  /tmp/midas/run00001.root:2720  events, 
0.21s
book_ttree: tree_struct.n_tree = 3     <<---- !!!!
book_ttree: tree_struct.n_tree = 4
Set run number 2 in ODB
Load ODB from run 2...OK
/tmp/midas/examples/root/run00002.mid:2347  /tmp/midas/run00002.root:2345  events, 
0.18s

 *** Break *** segmentation violation
----------------- \output ----------------------------

Adding this one line fixes the segfault problem for the root example expt.

----------------- code -------------------------
lamb@lamb2:/data/software/midas/midas_3705/src/src> svn diff mana.c
Index: mana.c
===================================================================
--- mana.c      (revision 3705)
+++ mana.c      (working copy)
@@ -1496,6 +1496,7 @@
    /* delete event tree */
    free(tree_struct.event_tree);
    tree_struct.event_tree = NULL;
+   tree_struct.n_tree = 0;
 
    // go to ROOT root directory
    gROOT->cd();
---------------- \code ---------------------------

Please check if this gives the intended behaviour. I am not very familiar with the 
midas internals.

Unfortunately my own analyzer's segfault problem is not solved by this patch. I 
guess I have to keep searching for a bug on my side.....  :-)


Cheers,

Randolf