Dear yt-users,<br><br>I&#39;m having a very peculiar problem, and I wonder if any of you have experienced this.  I have been using my desktop machine to make tons of images of some enzo simulations - literally several thousand images at this point - and yt has mysteriously stopped working.  I haven&#39;t done anything to python, attempted to upgrade yt, or anything like that... It just started throwing errors about 800 images into a script.  It seems that I can get this error by simply typing &#39;python&#39; and then &#39;from yt.mods import *&#39;.  The error message is at the end of this email.  If anybody could give me some advice, I&#39;d appreciate it - it seems like it might actually be deeper than simply a yt problem, though.<br>
<br>Thanks!<br><br>--Brian<br><br><br>nibbler:/Users/bwoshea/Desktop/CondBubbleSims/spitzer_0_1_cool%python<br>Python 2.5.4 (r254:67917, Dec 23 2008, 14:57:27) <br>[GCC 4.0.1 (Apple Computer, Inc. build 5363)] on darwin<br>
Type &quot;help&quot;, &quot;copyright&quot;, &quot;credits&quot; or &quot;license&quot; for more information.<br>&gt;&gt;&gt; from yt.mods import *<br>Traceback (most recent call last):<br>  File &quot;&lt;stdin&gt;&quot;, line 1, in &lt;module&gt;<br>
  File &quot;/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/site-packages/yt-2.0dev-py2.5-macosx-10.3-i386.egg/yt/mods.py&quot;, line 32, in &lt;module&gt;<br>    import yt.lagos as lagos<br>  File &quot;/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/site-packages/yt-2.0dev-py2.5-macosx-10.3-i386.egg/yt/lagos/__init__.py&quot;, line 97, in &lt;module&gt;<br>
    from OutputTypes import *<br>  File &quot;/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/site-packages/yt-2.0dev-py2.5-macosx-10.3-i386.egg/yt/lagos/OutputTypes.py&quot;, line 37, in &lt;module&gt;<br>
    _pf_store = ParameterFileStore()<br>  File &quot;/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/site-packages/yt-2.0dev-py2.5-macosx-10.3-i386.egg/yt/fido/ParameterFileStorage.py&quot;, line 73, in __init__<br>
    self._records = self.read_db()<br>  File &quot;/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/site-packages/yt-2.0dev-py2.5-macosx-10.3-i386.egg/yt/fido/ParameterFileStorage.py&quot;, line 211, in read_db<br>
    else: v[&#39;last_seen&#39;] = float(v[&#39;last_seen&#39;])<br>ValueError: invalid literal for float(): EnzoStaticOutput<br>&gt;&gt;&gt; <br><br>