In Chimera beta 1 build 2199 on Windows XP Professional SP2, I cannot open a FASTA file that contains a single sequence. (The file in question is attached and looks to be a valid FASTA file according to the documentation I have read on the FASTA format.) What should I do about this issue? Error log: Opening F:\H Biotech Engineering\cftr.fasta Error reading F:\H Biotech Engineering\cftr.fasta: IOError: Only one sequence found in Aligned FASTA file 'F:\H Biotech Engineering\cftr.fasta'; check your alignment file for errors (see reply log for Python traceback info) Traceback (most recent call last): File "C:\Program Files\Chimera\share\__main__.py", line 59, in ? value = chimeraInit.init(sys.argv) File "C:\Program Files\Chimera\share\chimeraInit.py", line 308, in init tkgui.eventLoop() File "C:\Program Files\Chimera\share\chimera\tkgui.py", line 2757, in eventLoop app.mainloop() File "C:\Program Files\Chimera\bin\Lib\lib-tk\Tkinter.py", line 965, in mainloop self.tk.mainloop(n) File "C:\Program Files\Chimera\bin\Lib\site-packages\Pmw\Pmw_1_2\lib\PmwBase.py", line 1747, in __call__ return apply(self.func, args) File "C:\Program Files\Chimera\share\chimera\baseDialog.py", line 229, in <lambda> self.__buttonFuncName(txt))() File "C:\Program Files\Chimera\share\chimera\baseDialog.py", line 470, in OK self.Apply() File "C:\Program Files\Chimera\share\chimera\tkgui.py", line 160, in Apply openPath(path, ftype) File "C:\Program Files\Chimera\share\chimera\tkgui.py", line 258, in openPath mols = chimera.openModels.open(path, type=ftype) File "C:\Program Files\Chimera\share\chimera\__init__.py", line 1086, in open models = func(filename, *args, **kw) File "C:\Program Files\Chimera\share\MultAlignViewer\ChimeraExtension.py", line 33, in <lambda> lambda fn, e=emo, ft=fileType: e.open(fn, ft), File "C:\Program Files\Chimera\share\MultAlignViewer\ChimeraExtension.py", line 25, in open self.module('MAViewer').MAViewer(fileName, fileType) File "C:\Program Files\Chimera\share\MultAlignViewer\MAViewer.py", line 59, in __init__ seqs, fileAttrs, fileMarkups = self.readFile( File "C:\Program Files\Chimera\share\MultAlignViewer\MAViewer.py", line 761, in readFile seqs, fileAttrs, fileMarkups = parseFile(fileName, fileType) File "C:\Program Files\Chimera\share\MultAlignViewer\parse.py", line 100, in parseFile raise IOError("Only one sequence found in %s file" IOError: Only one sequence found in Aligned FASTA file 'F:\H Biotech Engineering\cftr.fasta'; check your alignment file for errors Done opening F:\H Biotech Engineering\cftr.fasta