up2date no longer works on my home or office wordstation

Hello,
up2date no longer works on my home or office fedora workstations. It
seems to hangup (even overnight).It was working great. The "Progress
Dialog" "Fetching rpm headers" slidebar completes and I get the session
pasted below on my terminal session.

On the mail gui screen I see this:
yum channel fedora-core-1 from 
http://fedora.redhat.com/releases/fedora-core-1
 
I get "Packages Flagged to be Skipped" but I have not done that. 

The select packages window is empty.

I have tried deleting all of the files in the /var/spool/up2date
directory

As I said above this is happening on two different machines, did I foul
things up twice???

Thanks, 
Clem Taylor

[root@lxmv04 root]# up2date
Traceback (most recent call last):
  File "/usr/share/rhn/up2date_client/gui.py", line 1368, in
onChannelsPageNext
    self.pkgList = self.pList.getPackagesToInstall()
  File "/usr/share/rhn/up2date_client/packageList.py", line 520, in
getPackagesToInstall
    result = self.__skipPackages(result)
  File "/usr/share/rhn/up2date_client/packageList.py", line 549, in
__skipPackages
    packageList = self.__skipFiles(packageList)
  File "/usr/share/rhn/up2date_client/packageList.py", line 570, in
__skipFiles
    ignoreMsgCallback = self.ignoreMsgCallback)
  File "/usr/share/rhn/up2date_client/packageList.py", line 609, in
buildHeaderList
    hdr = headerList[pkg]
  File "/usr/share/rhn/up2date_client/headers.py", line 37, in
__getitem__
    self.__retrievePackage(item)
  File "/usr/share/rhn/up2date_client/headers.py", line 42, in
__retrievePackage
    hdr, sourceType = rpcServer.doCall(self.repos.getHeader, item)
  File "/usr/share/rhn/up2date_client/rpcServer.py", line 110, in doCall
    ret = apply(method, args, kwargs)
  File "/usr/share/rhn/up2date_client/repoDirector.py", line 31, in
getHeader
    return self.handlers[channel['type']].getHeader(pkg, msgCallback,
progressCallback)
  File "/usr/share/rhn/up2date_client/rpmSource.py", line 210, in
getHeader
    header = source.getHeader(pkg, progressCallback = progressCallback)
  File "/usr/share/rhn/up2date_client/repoBackends/yumRepo.py", line 96,
in getHeader
    hdrBuf = fh.read()
  File "/usr/lib/python2.2/gzip.py", line 156, in read
    self._read(readsize)
  File "/usr/lib/python2.2/gzip.py", line 210, in _read
    self._read_eof()
  File "/usr/lib/python2.2/gzip.py", line 245, in _read_eof
    raise ValueError, "CRC check failed"
ValueError: CRC check failed
Traceback (most recent call last):
  File "/usr/share/rhn/up2date_client/gui.py", line 1447, in
onSkippedPagePrepare
    maxlength = max(map(lambda x: len(x[0][0]), self.skipPkgList)) * 8
ValueError: min() or max() arg is an empty sequence