title: Pandas HDFStore weird behaviour
body: <p>I'm very confused by this, I have two scripts running from the same Notebook server. I have a HDFStore in the same folder, however for one script it looks empty and for the other it doesn't. Here is the same code run in both notebooks:</p>
  
  <pre><code>import os 
  os.getcwd()
  </code></pre>
  
  <p>Return NB 1: 'E:\DoingDataScience\Identify\Scripts'</p>
  
  <p>Return NB 2: 'E:\DoingDataScience\Identify\Scripts'</p>
  
  <pre><code>store = pd.HDFStore('data_test.h5')
  store.items
  </code></pre>
  
  <p>Return NB 1: </p>
  
  <pre><code>&lt;bound method HDFStore.items of &lt;class 'pandas.io.pytables.HDFStore'&gt;
  File path: data_test.h5
  /test_database            frame        (shape-&gt;[3,5])&gt;
  </code></pre>
  
  <p>Return NB 2:</p>
  
  <pre><code>&lt;bound method HDFStore.items of &lt;class 'pandas.io.pytables.HDFStore'&gt;
  File path: data_test.h5
  Empty&gt;
  </code></pre>
  
  <p>All the circumstances look the same. Does it keep track of the source of the Pandas DF? I thought it was maybe due the file already being opened by NB 1 because NB 1 created it. However killing NB 1 and restarting NB 2 didn't do anything either.</p>
  
  <p>EDIT: Added os.stats:</p>
  
  <p>NB 1 and NB 2 both:</p>
  
  <pre><code>nt.stat_result(st_mode=33206, st_ino=0L, st_dev=0L, st_nlink=0, 
  st_uid=0, st_gid=0, st_size=1311400L, st_atime=1465072325L, 
  st_mtime=1465149771L, st_ctime=1465072325L)
  </code></pre>
  
  <p>Update: Now after restarting I'm getting a new error:</p>
  
  <p>HDF5ExtError: HDF5 error back trace</p>
  
  <p>File "C:\aroot\work\hdf5-1.8.15-patch1\src\H5F.c", line 604, in H5Fopen
      unable to open file
    File "C:\aroot\work\hdf5-1.8.15-patch1\src\H5Fint.c", line 1085, in H5F_open
      unable to read superblock
    File "C:\aroot\work\hdf5-1.8.15-patch1\src\H5Fsuper.c", line 294, in H5F_super_read
      unable to load superblock
    File "C:\aroot\work\hdf5-1.8.15-patch1\src\H5AC.c", line 1320, in H5AC_protect
      H5C_protect() failed.
    File "C:\aroot\work\hdf5-1.8.15-patch1\src\H5C.c", line 3574, in H5C_protect
      can't load entry
    File "C:\aroot\work\hdf5-1.8.15-patch1\src\H5C.c", line 7954, in H5C_load_entry
      unable to load entry
    File "C:\aroot\work\hdf5-1.8.15-patch1\src\H5Fsuper_cache.c", line 476, in H5F_sblock_load
      truncated file: eof = 800, sblock->base_addr = 0, stored_eoa = 1181448</p>
  
  <p>End of HDF5 error back trace</p>
  
  <p>Unable to open/create file 'data_test.h5'</p>