From Bugzilla Helper:
User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:0.9.9) Gecko/20020408

Description of problem:
After upgrading to 7.3, the scanner stopped working.  sane-find-scanner was able
to find the vendor and product number of the scanner but could not find the
scanner's name.  The scanner is an HP5200C.  scanimage -L reported that there
was no scanner.  /var/log/messages had a ton of "usb_control/bulk_msg: timeout"
messages.

After hunting around a bit I found /usr/lib/sane and noticed that there were
very few symbolic links from the generic libraries to the specific libraries.  I
added "ln -s libsane-hp.so.1.0.7 libsane-hp.so.1" and now everything works fine.

I'm not sure why the upgrade didn't add the appropriate symbolic links.

Attached is a complete list of the /usr/lib/sane directory.  Only the
libsane-hp.so.1 link was added manually.

Note: the computer that had this install problem had originally been installed
with rh6.1 and subsequently upgraded to 6.2, 7.0, 7.1, 7.2, and 7.3